Stratasys J750 User Manual
  1. Manuals
  2. Brands
  3. Stratasys Manuals
  4. 3D Printers
  5. J750
  6. User manual

Stratasys J750 User Manual

3d printing system
Hide thumbs Also See for J750:
Table of Contents

Advertisement

Quick Links

See also: User Manual
User Guide
J750
3D Printing System
DOC-08040 Rev. E

Advertisement

Table of Contents
loading

Related Manuals for Stratasys J750

Summary of Contents for Stratasys J750

  • Page 1 User Guide J750 3D Printing System DOC-08040 Rev. E...
  • Page 2 (even if Stratasys has been advised of the possibility of such damages), resulting from: (i) the use or the inability to use the product or software;...
  • Page 3 6,259,962 6,569,373 6,658,314 7,209,797 7,225,045 7,300,619 7,364,686 7,369,915 7,500,846 7,604,768 7,658,976 7,725,209 7,896,639 7,958,841 7,962,237 7,991,498 7,996,101 8,219,234 8,278,866 8,323,017 8,469,692 8,781,615 8,865,047 8,932,511 9,017,589 9,020,627 9,031,680 9,227,365 Stratasys Ltd. www.stratasys.com   DOC-08040 Revision E December 2017 DOC-08040 Rev. E...
  • Page 4 Terms Used in This Guide 2  Safety Safety Features Symbols and Warning Labels Safety Guidelines Printer Installation Printer Operation UV Radiation Printer Maintenance Model and Support Materials UV Lamps First Aid for Working with Printing Materials Contact with Skin Contact with Eyes Ingestion Inhalation Waste Disposal 3  Introducing the Stratasys J750 3D Printing System Work Configurations Source Files Printing Materials Storage Shelf Life Exposure to Light Safety Considerations Disposal Work Environment Workstation Requirements 4  Operating and Maintaining the Stratasys J750 3D Printer Starting the   P rinter Loading Model and Support Cartridges Producing Models Preparing the Printer Starting Printing Printer Interface Color Key Printing Indicators...
  • Page 5 Shutting Down the Printer 4-22 Maintaining the Printer 4-25 Routine Maintenance Schedule 4-25 Maintenance Counters 4-26 UV Lamp Check 4-29 Pattern Test 4-29 Backing up the Printer Configuration 4-31 Improving Print Quality 4-32 Cleaning the Print Heads, Roller and Wiper 4-32 Cleaning the Roller Waste Collector and Inspecting the Roller Scraper 4-36 Replacing the Roller Scraper 4-39 Aligning the Print Heads 4-41 Cleaning the Print-Head Splash Shield 4-45 Optimizing (Calibrating) Print Heads 4-47 Replacing Print Heads 4-54 Testing and Calibrating the UV Lamps 4-64 Calibrating the Load Cells 4-71 Flushing the Print-block Heater 4-72 Replacing the Waste-Pump Tubes 4-76 Replacing the Vero PureWhite Material Filters 4-80 Replacing the Odor Filter 4-86 Replacing the UV Lamps...
  • Page 6 About This Guide Using This Guide For More Information Terms Used in This Guide DOC-08040 Rev. E...

  • Page 7: Using This Guide

    Stratasys J750 User Guide 1 About This Guide Using This Guide This user guide provides instructions for installing, operating and maintaining  J750 3D printing systems. It explains how to use features, and provides  practical examples to guide you as you use the system. The text and figures in this guide are based on the J750 3D printer, software  version 85.1.0. This guide assumes that— • all the hardware, software, and network components of your J750 system  are installed, configured, and operating correctly. ® • the operator has a working knowledge of the Windows  PC platform. For More Information Visit www.stratasys.com to download additional documents for this printer,  including documents in other languages. Also available on this site: details  about consumables and support contacts. If you have any questions or comments about the way information is  presented in this document, or if you have any suggestions for future editions,  please send a message to c-support@stratasys.com. DOC-08040 Rev. E...
  • Page 8 Stratasys J750 User Guide 1 About This Guide Terms Used in This Guide In the print preparation application: The surface displayed on  Build tray the screen that represents the actual build tray in the printer.  In the printer: The surface upon which models are produced. Cleaning fluid Cleanser for flushing material feed tubes and the printing block,  used to completely remove Model and Support material from  the system before loading another type of material in the  printer and before long-term shutdown. The cleaning fluid is  supplied in material cartridges. Client/user workstation The workstation on which   s oftware is installed for preparing  build trays for production on PolyJet printers. (There is no limit  to the number of client workstations.) Connex™ The technology of printing models by jetting multiple materials ...
  • Page 9 Safety Safety Features Symbols and Warning Labels Safety Guidelines Printer Installation Printer Operation UV Radiation Printer Maintenance Model and Support Materials UV Lamps First Aid for Working with Printing Materials Contact with Skin Contact with Eyes Ingestion Inhalation Waste Disposal DOC-08040 Rev. E...
  • Page 10 If the safety lock does not function correctly, do not use the printer, and contact your service provider. The transparent section of the cover blocks harmful UV  UV Screening radiation, allowing the operator to view the model as it is being  made. Figure 2-1 Front view of the Stratasys J750 printer The power to the printer is turned off in case of electrical  Circuit Breaker overcurrent.  Note: The circuit breaker is only accessible to service  personnel. UV-Lamp Overheating The power supplied to the UV lamp and the motion motors is ...
  • Page 11 2 Safety Grounded Chassis The chassis of the printer is grounded, to prevent electrical  shock. Note: The power outlet must be properly grounded, in  accordance with the local electric code, to provide this  protection. If the J750 3D printing system is not used as specified in this guide, the safety features may not provide adequate protection. Symbols and Warning Labels This following table lists the warning labels located on or in J750 printers. Warning Symbol Meaning Location...

  • Page 12: Safety Guidelines

    Stratasys J750 User Guide 2 Safety Safety Guidelines The following general guidelines, together with the instructions provided  throughout this user guide, ensure user safety while operating and  maintaining the system. If the system is not operated as specified, the user's safety may be compromised. ➢  Installation and removal of the printer should only be done by qualified  Printer Installation service personnel.  ➢  Connect the printer (and the UPS unit) to the electric outlet using a power  cord that is safety-certified. ➢  The electric outlet should be easily accessible, near the printer. ➢  Never connect the power plug to an outlet that does not have a ground  (earth) wire, and never disconnect the ground. Doing so might expose the  operator to serious danger from electric shock. ➢  The following safety statement is followed by translations to Finish, ...
  • Page 13 Stratasys J750 User Guide 2 Safety ➢  Service operations should be performed only by qualified personnel who  Printer Maintenance have been instructed in relevant safety precautions. ➢  Notify co-workers and those who have access to the J750 system before  beginning non-routine and hazardous work. Report any potential dangers and safety-related accidents to your safety officer or to other appropriate authorities. Model and Support materials are made of chemical substances. Although  Model and precautions must be taken when handling these materials directly, all Model  Support and Support materials used by the J750 system are handled in sealed  Materials cartridges. Normally, operators of the printer should never be directly exposed  to hazardous materials. In the unlikely event of a leak or spill, follow the  instructions that are included with the material cartridges used.
  • Page 14 Stratasys J750 User Guide 2 Safety UV Lamps UV lamps used by the printer to cure printing materials contain a small  amount of mercury. In the unlikely event of lamp breakage, avoid inhaling  mercury vapor, and ventilate the room. If the lamp ruptures (breaks) during  operation, leave the room and ventilate it thoroughly for about 30 minutes.  Use protective gloves to prevent contact with mercury and other lamp  components. Carefully remove spilled mercury with a method that prevents  the generation of mercury vapor, such as a syringe, packing tape or paper.  Place the broken lamp, mercury and contaminated materials in an air-tight,  non-metallic container. Dispose of the container in accordance with  applicable regulations. DOC-08040 Rev. E...
  • Page 15 Stratasys J750 User Guide 2 Safety First Aid for Working with Printing Materials In general, try to avoid direct contact with uncured printing material. If skin  or eyes come into contact with it, wash the area immediately and thoroughly  with water, and follow these first-aid instructions. The Material Safety Data Sheet (MSDS) that accompanies printing materials contains important safety information. Keep this in an accessible place where these materials are used and stored.
  • Page 16 Stratasys J750 User Guide 2 Safety Waste Disposal Fully cured printed models can be disposed of as ordinary office trash.  However, special care is required when handling printer waste (uncured  printing material). Printing ➢  When removing the waste container from the J750 printer, wear  Materials neoprene or nitrile gloves. ➢  To prevent liquid waste from splashing into the eyes, wear safety goggles. ➢  Liquid waste from the J750 printer is classified as hazardous industrial  waste. Therefore, printing-material waste must be packaged and disposed  of in a manner that prevents human contact with it and contamination of  water sources. ➢  Empty Model-material and Support-material cartridges contain residue of  their contents. Some leakage of this residue may occur through the broken  cartridge seal. Therefore, handle and store empty cartridges with care.  ➢  Do not attempt to reuse empty cartridges, and do not puncture them. ➢  Dispose of used cartridges and waste containers in accordance with local  regulations. ➢  Discard contaminated clothing, shoes, empty containers, etc., in  accordance with any applicable regulations. UV Lamps UV lamps used by the printer to cure printing materials contain a small  amount of mercury, and are considered “Universal Waste.” Recycle or discard  used lamps in accordance with applicable regulations.
  • Page 17 Introducing the Stratasys J750 3D Printing System Work Configurations Source Files Printing Materials Storage Shelf Life Exposure to Light Safety Considerations Disposal Work Environment Workstation Requirements   DOC-08040 Rev. E...
  • Page 18 Stratasys J750 User Guide 3 Introducing the Stratasys J750 3D Printing System   You can achieve the following results when printing 3D models on the J750  printer: • You   c an streamline and economize the process of producing models. ❒  Printing models made from different materials on the same build tray  (“mixed tray”), in the same print job, eliminates the time-consuming  need and expense of loading another material, flushing the system, and  sending a separate job to be printed. ❒  Alternating print jobs that use any of the Model materials (or material  combinations) loaded similarly does not require material  replacement—again, saving time and expense. • You can print objects with combinations of basic materials (digital materials), enabling you to choose from a wide range of possible  mechanical properties—from flexible to rigid.  • You can print parts (shells) of the same model—simultaneously—with  different materials (or material combinations) • You can print objects that have a “coating” made from a different material  than the main part of the object. • You can mix any combination of base materials, resulting in an extremely  wide range of available colors.  • If you designate colors for parts of a model at the design stage (with CAD  software) and save the model as a VRML file, the parts are automatically  assigned appropriate material combinations in GrabCAD Print for printing  the model with the desired colors.
  • Page 19 Stratasys J750 User Guide 3 Introducing the Stratasys J750 3D Printing System Work Configurations The Stratasys J750 3D printing system can be set up as a single-station system  or as a multi-station system. When connected to a local computer network,  the system can serve multiple users. In such configurations, each user (client)  prepares files   f or production. A software service, installed on the printer  computer, processes jobs and controls the printing. Figure 3-1 shows the printer set up in a multi-client configuration. Figure 3-1 Multi-client network configuration Source Files J750 printing systems produce three-dimensional models designed with most  CAD tools and some other 3D applications.  GrabCAD Print supports STL and, VRML files, and, in addition, native CAD  formats from these programs: Creo, SOLIDWORKS, NX, CATIA and  Inventor. To see the complete list of file formats supported by GrabCAD  Print, go to: help.grabcad.com/print/file-formats. J750 systems feature the capability of producing different types of model files  simultaneously. DOC-08040 Rev. E...
  • Page 20 Stratasys J750 User Guide 3 Introducing the Stratasys J750 3D Printing System Printing Materials J750 printers produce models by jetting thin layers of printing materials on  the build tray, until the complete model is formed. Two types of material are  used in this process: • Model material—which makes up the finished model • Support material—which fills gaps and spaces in the model during  printing, and is removed after printing For up-to-date information about PolyJet printing materials and their properties, go to www.stratasys.com/materials/polyjet. Materials used for printing models with J750 printers are made of resins,  Storage which are composed of reactive monomers and oligomers. Although printing  materials are supplied in sealed, UV-proof cartridges, care must be taken  when storing and handling them. Follow these guidelines to protect operators  and the environment, and to ensure optimum results.  • To ensure product stability, do not allow these materials to come into ...
  • Page 21 Stratasys J750 User Guide 3 Introducing the Stratasys J750 3D Printing System Safety Before being cured, resins are hazardous materials. To prevent possible health  Considerations hazards, follow these precautions regarding printing materials:  • Do not expose to flames, heat or sparks. • Prevent contact with skin and eyes. • Ventilate areas where they are handled.  • Keep them separate from food and drink. Cured plastic parts, however, are safe. They can be handled and stored  without precautions. You can find more safety information about resins in: "Safety Guidelines" on page 2-4 "First Aid for Working with Printing Materials" on page 2-7 Dispose of cartridges of model and support material in accordance with all ...
  • Page 22 Operating and Maintaining the Stratasys J750 3D Printer Starting the   P rinter Loading Model and Support Cartridges Producing Models Preparing the Printer Starting Printing Printer Interface Color Key Printing Indicators Resuming Production After Printing has Stopped Changing the Printing Material 4-11 Changing Model Materials Without Flushing 4-16 Advanced Settings 4-18 Keeping the Printer in Idle Mode 4-21 Shutting Down the Printer 4-22 Maintaining the Printer 4-25 Routine Maintenance Schedule 4-25 Maintenance Counters 4-26 UV Lamp Check 4-29 Pattern Test 4-29 Backing up the Printer Configuration 4-31 Improving Print Quality...
  • Page 23 Figure 4-1 The Stratasys J750 3D Printer Starting the Printer Caution Do not attempt to operate the printer before being trained by a Stratasys Customer Support representative. Observe all safety warnings and follow the safety guidelines described in Chapter 2.
  • Page 24 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 2.  After the printer-control computer boots, log in to Windows and launch  the printer-control program: A HASP plug containing a valid product activation key is required on the printer computer. This is supplied during printer installation or upgrade. If the application does not open and a HASP message appears, contact your dealer or Stratasys Customer Support.
  • Page 25 The material cabinet contains cartridges of printing material. For this purpose, an RFID module is built into the cabinet. Tampering with this module will render the printer inoperable and may void Stratasys warranties and service contracts. Important: If you need to replace the Model material currently installed with another type, see "Changing the Printing Material"...
  • Page 26 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Producing Models Models can be printed after they are arranged on a virtual build tray in the  GrabCAD Print application. For information about preparing model files for  printing, see the GrabCAD Print online documentation. Preparing the Before beginning to produce models, it is recommended that you check the  Printer current printing quality of the print heads by performing a pattern test (see  "Pattern Test" on page 4-29). To prepare the printer for producing models: 1.  Make sure that the build tray in the printer is empty and clean. If not,  remove cured material with the scraper, and clean the tray thoroughly  with a wet cleaning cloth. Caution Use protective gloves when cleaning the build tray, and be careful of the sharp edges of the scraper blade.
  • Page 27 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer You can monitor printer status by switching the printer interface display. To  do this, click the display toggle button on the printer interface screen. Figure 4-4 Printer status To begin printing: Starting Printing ➢  On the printer interface, click the red button to switch the printer to  online mode. The color of the button changes from red to green (see the figure on  page 4-3).   I f there is a job in the printing queue, it is sent to the printer. When switching the printer to online mode, a message is displayed if a maintenance activity is required to ensure optimum printing quality.
  • Page 28 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Printer The background colors in the printer indicator fields tell you at a glance  Interface whether or not the value or item is suitable or ready for printing.  Color Key • Green—suitable/ready for printing For example, in Figure 4-4 on the previous page: ❒  Heads (°C)—The heads have reached the temperature required for  printing models. ❒  Ambient—The ambient temperature of the printing chamber is within  the acceptable range. ❒  Heads Liquid—The level of Model and Support material in the  print-block reservoir is OK. ❒  Heads Vacuum—The vacuum level in the system is within the  acceptable range. ❒  Pre-Heater—The Model and Support resins need to be heated before  being supplied to the print block. The temperature has reached the  acceptable range.
  • Page 29 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Printing The printer interface screen changes when you send a print job to the printer,  Indicators if the printer is on line: • The mode changes from Pre-print to Printing.  • The specific activity being performed is shown in the “current activity”  field.  • Current job-printing information is displayed. • The printing progress bar is displayed. • The Stop and Pause buttons are enabled. When the weight of a cartridge drops below 100 grams, the display of the  material level in the printer interface is red.  Figure 4-5 Printer interface during printing DOC-08040 Rev. E...
  • Page 30 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Resuming Production After Printing has Stopped If the printing process is interrupted, the print manager stops sending slices  to the printer. This can happen, for example, if the printing material runs out  in the middle of a print job, and you do not replace the empty cartridge  immediately.  After the printer changes to Standby or Idle mode, you need to  resume printing from the print manager in GrabCAD Print. After printing stops, the printer goes into Standby mode, when heating of the print heads is reduced. About 10 hours later, the printer goes into Idle mode, when heating of the print heads is stopped.
  • Page 31 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer   Figure 4-7 Printer interface after interrupted printing 5.  If, for any reason, the correct number does not appear in the dialog box,  enter the number and click OK. You cannot continue printing the model if: • The number of the last slice printed does not appear in the printer  interface, even if the server computer displays the   c onfirmation dialog box. • There was a relatively long interruption in printing, even if the “last slice”  and   i ndicators are correct. The part of the model already printed may  deform or shrink, and there might be a visible difference between it and  the newly printed part. The effects of a printing stoppage on a model  depend on the model size and structure, Model material used, ambient  temperature and the length of the stoppage. If you cannot continue printing: 1. ...
  • Page 32 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Changing the Printing Material Before producing models using a different type of printing material than is  currently installed, run the Material Replacement wizard to flush the print  block and feed tubes. After using the wizard to change the Support material and certain Model materials, Head Optimization is required before printing models.
  • Page 33 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 4.  Choose the configuration for producing models: ❒  6 materials ❒  3 materials   Figure 4-9 Material Replacement Options 6 Materials Each of the three Model print heads is loaded with two different  materials.    Figure 4-10 Six materials loaded in the print heads ❒  Once the materials are loaded, you can print with any single material, ...
  • Page 34 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 3 Materials Both sections of eachModel print head are loaded with   t he same material.   Figure 4-11 Three materials loaded in the print heads ❒  Up to three Model materials are available, with high-speed printing. 5.  In the Required materials section of the wizard screen, select one or more  replacement materials cartridges. 6.  For Model materials, select Both if you need to load two replacement  cartridges. Loading one replacement cartridge is more economical because it  potentially requires less flushing of material currently in the system.  However, when one cartridge is not sufficient, loading two cartridges ...
  • Page 35 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer The wizard thoroughly flushes   t he feed tubes and print heads needed  for printing, based on your selections in the previous screens.  There are additional settings that you can select for special purposes (see "Advanced Settings"). If necessary, click Advanced Settings before clicking Next. 10. Click Next to begin the material replacement process in the printer.
  • Page 36 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer If you continue, you must complete the material replacement process before you can produce models. To replace material containers at another time, click Cancel. If you continue (by clicking OK) and you do not complete the process, you will need to run the wizard again before producing models.
  • Page 37 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Changing Model Materials Without Flushing You can change the Model materials without flushing. Use this option when  the color or mechanical properties of the printed model are unimportant. To change Model materials without flushing: 1.  In the Material Replacement Options screen, click Advanced Settings. 2.  In the Advanced Settings screen, select Manual slot selection and click  Apply.   Figure 4-14 Manual slot selection 3. ...
  • Page 38 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 4.  In the confirmation message that appears, click Yes to continue.    Figure 4-16 Replace without flushing confirmation message 5.  In the Cartridge Positioning and Process Progression screen, click Start.   Figure 4-17 Cartridge Positioning and Process Progression screen 6.  Read the Warning message that appears, and click OK to continue.
  • Page 39 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Advanced The Advanced Settings dialog box enables you to configure the Material  Settings Replacement wizard for special purposes. If necessary, click Advanced Settings in the Material Replacement Options screen before clicking Next. Positioning By default, Automatic slot selection determines the best slot locations for the  cartridges in the material cabinet, based on materials currently in the system.  This ensures minimum flushing of materials currently loaded. Select Manual slot selection if—                        ...
  • Page 40 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 3.  In the Material Replacement Options screen, select or clear the Both cartridges check box for each slot, as required. Note: When changing Support material, select at least two Support material cartridge slots—one from A (either L or R) and one from B (either L or R).
  • Page 41 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Additional The flushing cycle you select in the Material Replacement Options screen  Flushing Cycles determines how thoroughly to flush out material currently in the system.  After selecting the Economy cycle and completing the wizard, you might  decide that you require a more thorough flushing, to ensure accurate model  color. Or, you may notice that printed models are not satisfactory because  they contain traces of the previous material. If so, you can flush out more  material, so that the next models will be printed with pure material. To perform additional flushing cycles: ➢  In the Advanced Settings screen, select Enable "flush again" options and  click Apply.   Figure 4-22 Enable flush again options selected The Material Replacement Options screen appears, where you can select the ...
  • Page 42 To put the printer into Idle mode: ➢  From the File menu (in the printer interface) click Exit. Note: The printer remains in Idle mode until you open the J750 printer application and begin printing again. When the printer is in Idle mode, do not turn it off. It can remain in this mode—...
  • Page 43 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Shutting Down the Printer You only need to shut down the J750 printer if it will not be used for a week  or more. Otherwise, the printer can remain on, in Idle mode.  The Shutdown process flushes printing materials from printer components. To avoid flushing out valuable material, make sure to print models at least once a week.
  • Page 44 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 3.  Select the option corresponding to the length of time that the printer will  not be used—less or more than 30 days. Note: Before selecting More than 30 days, make sure that cleaning-fluid cartridges are available. Figure 4-24 Shutdown options 4.  In the next screen, verify that the tray is empty and click Next.                        ...
  • Page 45 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 5.  Follow the instructions until cleaning is completed. 6.  When the final wizard screen appears, close the printer-control  application and shut down the printer computer. Figure 4-27 Final Shutdown wizard screen 7.  After the printer computer shuts down, turn off the main power switch at  the back of the printer   ( see Figure 4-2 on page 4-2). DOC-08040 Rev. E 4-24...

  • Page 46: For More Information 1

    Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Maintaining the Printer Performing routine maintenance tasks is essential for getting satisfactory  results from J750 3D printers. Perform the tasks at specified intervals. Routine Frequency Task For More Maintenance Information Schedule Before printing Clean the UV lamp lenses. Before / after printing Check the UV lamp overheating indicator.
  • Page 47 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Frequency Task For More Information Monthly, and after Check the alignment of the print heads. See "Aligning replacing print heads the Print Heads" on page 4-41. Monthly Remove and clean the print-head splash See "Cleaning...
  • Page 48 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Figure 4-28 Selecting Maintenance Counters If there is a maintenance task due, this is indicated on the main interface  screen.   Figure 4-29 Maintenance Required indicator If this indicator appears, you can display the Maintenance Counters screen by  clicking on it. The Maintenance Required indicator appears by default for most operator- performed maintenance tasks. The check box under “User Warning” controls whether or not it appears when a particular task is due.
  • Page 49 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer   Figure 4-30 Maintenance Counters screen For maintenance tasks that are controlled by wizards, the dates and printing  times are reset automatically when the relevant wizard is run and completed  successfully. Manual maintenance tasks (for example, roller inspection and  wiper replacement) are reset by clicking the reset button in the screen. DOC-08040 Rev. E 4-28...
  • Page 50 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer UV Lamp A heat-sensitive label is fixed to the UV lamp covers as a warning against  Check overheating. Its center changes from white to black if the temperature of the  cover reaches 65°C (150°F). If this occurs, do not use the printer, and call  your service provider. As a precaution, it is recommended that you check the  label before and after printing.  Figure 4-31 Heat-sensitive label on UV lamp cover If the UV lamp continues to overheat, and the temperature around the lamp reaches 90°C (194°F), a heat fuse turns off the electricity to the power to the...
  • Page 51 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Figure 4-32 Selecting Pattern Test 5.  Click Yes in the Confirm dialog box to begin. Figure 4-33 Pattern Test confirmation 6.  If the build tray is not clear, click No in the following dialog box. Figure 4-34 Build tray (Z) level adjustment This lowers the build tray, so that models on the tray are not damaged. DOC-08040 Rev. E 4-30...
  • Page 52 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer The printer prints a series of lines on the test paper (see next figure). Figure 4-35 Sample Pattern Test 7.  Carefully inspect the test paper to see if there are missing lines.  Too many missing lines, especially if they are in the same area, indicates  that the quality of printing when producing models will be poor. If this is  the case, see "Improving Print Quality" on the next page. Note: Acceptable model quality is subjective, and depends on the type and scale (size) of the models produced. As a rule, however, more than 10 missing lines in one area of a column is considered unacceptable.
  • Page 53 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Improving If you suspect that print quality is poor, perform the pattern test (see "Pattern  Print Quality Test" on page 4-29). If the results are poor, use the following procedure to  improve print quality. If the results of the last pattern test are poor: 1.  From the Options menu, select Purge Sequence, or press F4. 2.  In the confirmation dialog box, click Yes. The print heads are purged of Model and Support material, and the wiper  removes excess material from them. 3.  Repeat the purge sequence. 4.  Perform the pattern test.
  • Page 54 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 2.  Start the Cleaning wizard from the Options menu. Figure 4-37 Options > Wizards menu Figure 4-38 Preparation check The printer moves components to the cleaning position. 3.  When the following screen appears, open the printer. Figure 4-39 Wizard screen during cleaning tasks DOC-08040 Rev. E 4-33...
  • Page 55 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Warning: Hot Surface The print head orifice plates (bottom surface) may be hot. Do not touch them with your bare hands, and proceed with caution. 4.  Place the mirror on the build tray. ...
  • Page 56 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 11. Remove any pieces of waste material collected in the purge unit. If  necessary, remove the waste collector to clean it. Wipe the rubber seal.   Figure 4-41 Purge unit waste collector Note: When returning the waste collector to the purge unit, make sure to insert it as shown. 12. Inspect the wiper.
  • Page 57 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Cleaning the The roller waste collector removes waste material scraped from the roller.  Roller Waste Suction removes this waste to the printer’s waste container. Collector and This assembly should be cleaned weekly to prevent a blockage in the tubes  Inspecting the leading to the waste container, so that waste material does not overflow into  Roller Scraper the printer. To clean the roller waste collector: 1.  Prepare— ❒  M2.5 and M2 Hex (Allen) keys ❒  disposable cleaning gloves ❒ ...
  • Page 58 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 4.  Loosen the two screws securing the suction tube on the print block. Figure 4-44 Lifting the suction tube 5.  Lift the suction tube to secure it in a raised position. 6.  Remove the two screws securing the covering of the roller waste collector  and remove it. Be very careful to save the covering screws. These are special screws; if they are lost, you need to order replacements.
  • Page 59 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 8.  Clean the roller waste collector and the scraper blade surface using cotton  swabs. Make sure to remove any remaining printing materials. Figure 4-46 Cleaning the roller waste collector Before replacing the covering, you can check the effectiveness of the roller scraper—see below. To check the effectiveness of the roller scraper: 1. ...
  • Page 60 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 2.  Loosen the screws securing the suction tube. Figure 4-48 Suction tube correctly positioned 3.  Lower the suction tube so that the hole in the panel behind the tube is  visible, and tighten the screws to secure the tube.  4.  Attach the right-UV-lamp assembly to the print block and reconnect the  UV power and fan cables. Replacing the You should replace the roller scraper blade— Roller Scraper • after 1,000 hours of printing. • if it does not effectively keep the roller clean. You should periodically test the effectiveness of the roller scraper when you clean the roller waste collector.
  • Page 61 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 4.  Remove the screws that secure the roller scraper assembly.  Figure 4-50 Removing the roller scraper screws 5.  Remove the scraper blade and discard it. Figure 4-51 Removing the old roller scraper blade 6.  Place the new scraper blade onto the pins in the holder, as shown.  Figure 4-52 Inserting the new roller scraper blade DOC-08040 Rev.
  • Page 62 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 7.  Insert and tighten the roller scraper blade screws. Important: Tighten the screws in the order shown in Figure 4-53. Use the new screws supplied in the replacement kit Figure 4-53 Tightening the roller scraper screws 8. ...
  • Page 63 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 5.  When instructed to do so, place the transparency on the build tray— next  to the left and rear edges of the tray, as shown in the following figure. Figure 4-54 Positioning the transparency on the build tray 6.  Make sure that the transparency sheet is lying flat, and tape it to the tray. 7.  In the wizard screen, select the check box to confirm that the  transparency sheet is on the build tray, and click Next. The printer prints the head alignment test on the transparency. 8.  When the following screen appears, remove the transparency. Figure 4-55 Head Alignment wizard—steps 8–10 The transparency sheet is printed with sets of vertical lines in seven ...
  • Page 64 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 9.  For each column of lines, use a magnifying glass or loupe to inspect pairs  of consecutive rows printed on the transparency to see where the vertical  lines align. Figure 4-57 Comparing rows of alignment lines Note: It does not matter which pair of lines you inspect, since they were all printed by the same head. Choose a pair of clearly printed lines for the inspection.
  • Page 65 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer When you have finished aligning all of the heads, the following screen is  displayed. Figure 4-59 Parameter update confirmation 13. Continue as follows: ❒  To make the alignment changes in the printer, make sure that Update system with new parameters is selected, and click Next. ❒  To recheck the alignment test results before making the alignment  changes in the printer, click Previous. ❒  If you do not want to make alignment changes in the printer at this  time, select Keep previous parameters, and click Next. 14. In the following screen, you can choose to either repeat the head  alignment procedure or close the wizard.  ❒  If the most closely aligned vertical lines for a print head were at either  extreme, choose Repeat the test, then click Next. ...
  • Page 66 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Cleaning the To prevent excess printing material from accumulating around the print  Print-Head heads, a splash shield is installed on the bottom of the print block. Remove  Splash Shield the shield and clean it once a month, when cleaning the print heads (see  "Cleaning the Print Heads, Roller and Wiper" on page 4-32). To remove the print-head splash shield: 1.  Run the Cleaning wizard from the Options menu. When the printer moves components to the cleaning position, the  following screen appears. Figure 4-61 Wizard screen during cleaning tasks 2.  Open the printer and place a mirror on the build tray.
  • Page 67 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 4.  Using a 2-mm hex (Allen) key, remove the screws to remove the splash  shield. Figure 4-62 Print-head splash shield installed on the print block Figure 4-63 Removing the print-head splash shield Warning: Hot Surface The print head orifice plates (bottom surface) may be hot. Do not touch them with your bare hands, and proceed with caution.
  • Page 68 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Optimizing The condition of the print heads directly affects the quality of printed models.  (Calibrating) To maintain optimum printing, you should routinely test the print heads, and  Print Heads calibrate them to the best working configuration possible by running the  Head Optimization wizard every 300 hours of printing.  During this procedure, you place a scale on the build tray and connect it to  the printer. Printing material (resin) is jetted from each head and its weight is  automatically recorded and the wizard determines how to optimize the print  heads.  If, during the optimization process, the wizard determines that a print head is  faulty—or that it is negatively affecting layer uniformity with the current head  configuration—the wizard instructs you to replace it. If this happens, you can  continue the wizard to replace the print head, or abort the wizard, to replace  the head at another time.  Run the Head Optimization wizard every 300 hours of printing or whenever...
  • Page 69 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 3.  In the opening wizard screen, click Next to begin. The Wizard Conditions screen appears. 4.  Read the conditions, select I Agree and click Next. 5.  In the following screen, select Continue with Head optimization if you have  recently cleaned the print heads. Otherwise, cancel the wizard and run the  Cleaning wizard. Figure 4-65 Clean print heads screen 6.  In the following screen, make sure Optimize all print heads is selected,  and click Next. Figure 4-66 Procedure selection screen DOC-08040 Rev.
  • Page 70 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 7.  Select the printing mode for which you want to optimize the print heads  and click Next. Figure 4-67 Printing mode selection 8.  When the following screen appears, tape a sheet of pink paper to the  surface left of the build tray, close the cover and click Next. Figure 4-68 Preparations confirmation The printer prints a frame on the build tray and then prints the Pattern  Test. 9.  When the Pattern Test is printed, carefully inspect it, using the Missing  Nozzles Ruler to see if there are missing lines. Figure 4-69 Inspecting the Pattern Test Each missing line represents a faulty nozzle in the print head.
  • Page 71 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 10. In the following wizard screen, enter the number of missing nozzles for  each print head and click Next. Figure 4-70 Enter Missing Nozzles screen 11. The wizard continues according to the number of missing nozzles you  entered.  ❒  If there are too many missing nozzles for acceptable printing, the  wizard instructs you to replace the defective print head(s). You can do  this now, or abort the wizard. If you are prepared to replace print heads now, the wizard guides you  through the procedure when you click Next. Make sure you have  replacement heads and the required tools (see page 4-55). Then,  continue with "Preparing the Print Block" on page 4-56. Figure 4-71 Head replacement due to missing nozzles ❒  If the number of missing nozzles in all print heads is acceptable, the ...
  • Page 72 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 12. Set up the scale in the printer by performing the steps listed in the wizard  screen. Figure 4-72 Setting up the Head Optimization scale 13. After confirming all of the items listed in the wizard screen, click Next. Printing material (resin) is jetted from each head and its weight is  automatically recorded. This process is repeated for each printing mode,  after which the following screen appears. Figure 4-73 Emptying the resin container 14. Carefully remove the resin container from the scale and empty it into the  purge unit in the printer. Then return the container to the scale. Caution: The resin in the container is uncured To prevent contact with skin, wear neoprene or nitrile gloves.
  • Page 73 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 16. When the following screen appears, remove the scale and clean the build  tray.  Figure 4-74 Remove Scale confirmation screen 17. In the wizard screen, confirm that the build tray is clear and that the  cover is closed, and click Next. The wizard uses the data collected to analyze the condition of the print  heads and optimize them so they print models with a uniform layer of  material.  ❒  If the heads are in satisfactory condition, the following wizard screen  appears. Figure 4-75 Final wizard screen, after optimizing print heads DOC-08040 Rev. E...
  • Page 74 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer ❒  If the wizard determines that a print head is faulty—or that it is  negatively affecting model quality with the current head  configuration—you need to replace it. Indicate whether or not you  want to do so now. Figure 4-76 Defective print heads found •  Select Replace defective head(s) if you are prepared to replace the  print heads now (see below).  or— •  Select Abort wizard if you want to replace the print heads at  another time. Replace print heads only after consulting with a Stratasys-authorized customer-support engineer.
  • Page 75 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Replacing The condition of the print heads directly affects the quality of printed models.  Print Heads You may need to replace a print head if one or more of the following  symptoms occurs: • The Head Optimization wizard determines that a print head is defective.  (See "Optimizing (Calibrating) Print Heads" on page 4-47.) • There are noticeable grooves in the surface of printed models. • Visual inspection of the head reveals that its surface is damaged—peeling  or bubbles in the nozzle area. • The printer interface displays a warning or malfunction message relating  to a print head— ❒  Head Heater temperature timeout ❒  Head Heater thermistor open ❒  Head Heater thermistor short Replace print heads only after consulting with a Stratasys-authorized customer-support engineer.
  • Page 76 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer To replace a print head: 1.  Prepare— ❒  replacement print head(s) ❒  isopropanol (IPA—isopropyl alcohol) or ethanol (ethyl alcohol) ❒  disposable cleaning gloves (supplied with the print head; or use any  clean, powder-free protective gloves) ❒  a supplied cleaning cloth or equivalent ❒  a mirror ❒  a 3-mm hex (Allen) key, depending on the type of print block ❒  the scale supplied for use in the Head Optimization wizard (Weight  Test) ❒  the Missing Nozzles ruler Important: Make sure that you have these items and that the scale is calibrated and fully charged before continuing.
  • Page 77 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 6.  In the following screen, select Replace faulty heads, and click Next. Figure 4-78 Procedure selection screen Preparing the 7.  Select the print head(s) needing replacement, and click Next. Print Block Figure 4-79 Head selection screen The printer heats and empties the print block, and prepares the printer.  (This should take up to 15 minutes.) The following screen appears when the printer is ready for you to replace  print heads. Figure 4-80 Printer ready for head replacement 8. ...
  • Page 78 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Removing the 9.  On the front of the print block, loosen the screws that secure the cover  protecting the print-head driver cards.  Defective Head Figure 4-81 Loosening the driver-card cover screws 10. Lift up the cover. DOC-08040 Rev. E 4-57...
  • Page 79 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 11. Loosen the screws that secure the driver-card bracket, and lower the  bracket. Figure 4-82 Loosening the driver-card bracket screws 12. Release the driver-card support. Figure 4-83 Releasing the driver-card support DOC-08040 Rev. E 4-58...
  • Page 80 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 13. Remove the driver card by releasing the latch at the points shown. Figure 4-84 Releasing the driver-card latch 14. Release the upper and lower screws that secure the print head in the  block. (If necessary, you may use a 4-mm hex (Allen) key to loosen the  screws.) Figure 4-85 Releasing the print-head locking screws DOC-08040 Rev. E 4-59...
  • Page 81 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 15. Press down on the upper and lower locking screws to release the print  head, and remove it from the bottom of the print block. Figure 4-86 Releasing the print head 16. Make sure that along with the head, you remove the four (4) rubber O- ring seals. Figure 4-87 O-ring seals on the print head DOC-08040 Rev. E 4-60...
  • Page 82 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Important If the seals are not removed with the head, they are probably stuck to the print block housing. If so, remove them. Figure 4-88 Making sure the O-rings are not stuck to the print block Installing the 17. Place four (4) O-ring seals in the replacement head (see Figure 4-87 on the ...
  • Page 83 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 22.  I n the Replace print heads screen, select the check box to confirm that  you have replaced the head(s), and click Next. Figure 4-90 Head replacement confirmation 23.  W ith your fingers, make sure that the new head is level and even with the  other heads. Figure 4-91 Checking the level of the new head 24.  C onfirm that the heads are level by selecting the check box in the ...
  • Page 84 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 25.  I n the next wizard screen, confirm that you have removed all tools and  objects from the printer. Figure 4-93 Cleared-tray confirmation screen 26.  C lose the printer cover. The wizard continues by heating the heads, then filling and purging them.  If there are no installation problems, the optimization procedure begins,  to calibrate the print heads to the best working configuration—see  "Optimizing (Calibrating) Print Heads" on page 4-47.     If installation problems are detected, the wizard alerts you and instructs  you how to continue (see "Installation Problems" below). 27. After replacing print heads, you should check the head alignment before  using the printer to produce models. In the final wizard screen, select  Optimize all print heads and click Next to run the Head Alignment wizard. Figure 4-94 Final wizard Screen Installation If the printer detects that there is a problem after you install print heads, a ...

  • Page 85: Uv Radiation 2

    Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer ➢  If the replacement head was not calibrated by Stratasys, remove the head  and replace it with another one.  Figure 4-95 Invalid-head warning Contact your Stratasys service provider about the uncalibrated head. Testing and The level of UV radiation from the lamps used for curing models can change  Calibrating the over time. To ensure optimum curing of models during printing, a pop-up  UV Lamps message reminds you to test the lamps and calibrate the level of UV radiation  after every 300 hours of printing. You do this by running the UV Calibration  Wizard. To measure the UV radiation, you need: • Stratasys TOL-03005-S (UV sensor and cable) or— • a stand-alone UV radiation meter, approved for use with the printer The wizard compares the measured radiation to the recommended radiation  level for each of the lamps, at each printing mode—High Speed, and High  Quality and Digital Material. When calibrating the lamps, the wizard attempts to adjust the radiation level, ...
  • Page 86 Figure 4-97 UV device selection UV Measuring Device When you use the Stratasys UV sensor box (TOL-03005-S), you connect it to the printer. The wizard automatically measures and calibrates the UV radiation. If you use a stand-alone UV radiation meter, you need to manually enter the readings from the meter in the wizard screens.
  • Page 87 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 4.  Make sure that the build tray is empty. Confirm this in the wizard screen  and click Next. Figure 4-98 Printer preparation ➢  When using a Stratasys UV sensor box that you connect to the printer  (TOL-03005-S), continue with "UV Sensor Connected to Printer" on the  next page. ➢  When using a stand-alone UV radiation meter, continue with "External  UV Meter" on page 4-68. DOC-08040 Rev. E 4-66...
  • Page 88 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer UV Sensor The following steps apply when using the Stratasys UV sensor box that you  Connected to connect to the printer. They do not apply when using a   U V external radiation  Printer measuring device. 1.  To synchronize the wizard and the UV sensor, enter the CF number from  the label on the back of the UV sensor box. Figure 4-99 UV sensor synchronization Figure 4-100 Label on the bottom of the UV sensor box 2. ...
  • Page 89 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 3.  Connect the UV sensor cable to the connector in the printer. To ensure that the sensor cable does not interfere with the build tray when it is raised, route it in back of the sensor. 4.  Confirm the items listed in the wizard screen and click Next.
  • Page 90 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 2.  Lead the cable out of the printer so that you can close the printer, and  tape it down to make sure that it does not interfere with the moving print  block.   Figure 4-104 Correct UV-sensor placement 3.  Close the printer, while checking that the sensor does not move out of  position. 4.  Set the UV meter to measure mJ/cm2. 5.  Set the range on the meter to 2,000. 6.  Connect the cable from the sensor to the UV meter.  7.  Turn on the UV meter, and wait until “0 0 0.0” appears on the display. 8.  In the wizard screen, confirm that the sensor is positioned correctly, and  click Next. Continue with "UV Measurement               "  on the next page.                ...

  • Page 91: Uv Lamps 2

    Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer The UV lamps power up and stabilize. (This takes several minutes.) Then, the  Measurement print block passes over the sensor and the wizard compares the measured  radiation to the recommended level for each UV lamp and printing mode.  During this process, which takes 20–40 minutes, you need to monitor the  progress as displayed in the wizard screen. Figure 4-105 UV measurement progress When using a stand-alone radiation meter, reset the meter and enter the  reading (measurement) when you are prompted to do so.   Figure 4-106 UV Measurement dialog box If the UV level measured is not acceptable, the wizard calibrates the UV lamp  by adjusting the current supplied to it, and then tests it again. When all UV tests have finished, the results are displayed, showing the  condition of the lamps after calibration (see Figure 4-107 below). Figure 4-107 Results and condition of UV lamps after calibration DOC-08040 Rev.

  • Page 92: Printing Materials 3

    Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer After examining the UV calibration results: 1.  Click Next. 2.  Remove the UV sensor and close the printer cover. After confirming the  items listed in the wizard screen, click Next. If the results are not acceptable for quality printing, this is indicated in the  final wizard screen. 3.  In the final wizard screen, click Done. Figure 4-108 Final UV Calibration Wizard screen Calibrating the Load cells are sensors that measure the weight of the material cartridges and  Load Cells the waste container in the printer. It is important that you periodically check ...

  • Page 93: Advanced Settings 4

    Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Figure 4-110 Weight stabilization 5.  Select the check box, and click Next. 6.  Click Done in the final wizard screen.   Flushing the Print-block If the printer was once configured to print with six Model materials and later  Heater configured to print with three Model materials (High Speed mode), the  unused channels in the print-block heater need to be periodically flushed to  prevent clogging. A reminder message appears if 250 printing hours have  passed since changing to 3-material printing or since the print-block heater  was last flushed. This procedure takes about 90 minutes to complete.
  • Page 94 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Figure 4-112 Material Replacement Options screen 4.  In the Advanced Settings screen, select Manual slot selection and click  Apply. Figure 4-113 Manual slot selection DOC-08040 Rev. E 4-73...
  • Page 95 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 5.  When the Material Replacement Options screen opens again, select the  following: ❒  6 materials ❒  Economy Figure 4-114 Selections in the Material Replacement Options screen Make sure that the printer is loaded with the selected materials. This procedure requires six Model materials to flush all of the channels in the print- block heater.
  • Page 96 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Figure 4-115 Wizard Completed screen 9.  Click Done. The printer-control application restarts. 10. To return to the 3-material printing mode, run the Material Replacement  wizard again. 11. In the Material Replacement Options screen, select the following: ❒  3 materials ❒  Economy 12. Click Next. 13. In the Cartridge positioning screen, make sure that the material  cartridges are properly positioned, and click Start. The wizard fills both channels of each print head with the selected  material This process takes about 15 minutes.  14. When the Wizard Completed screen appears, click Done.

  • Page 97: Maintenance Counters 4

    Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Replacing the The tubes that pump waste material from the roller waste collector and the  Waste-Pump purge unit should be replaced after 1500 hours of printing. At this time, a  Tubes counter should display a maintenance message on the printer interface  screen.  Figure 4-116 Maintenance message You can verify that the pump tubes need to be replaced by examining the  waste pump maintenance counters.  To open the Maintenance Counters screen: ➢  Click on the "Maintenance Required" indicator. or— ➢  From the Options menu, select Maintenance Counters. Figure 4-117 Selecting Maintenance Counters from the Options menu.
  • Page 98 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer To replace pump tubes, you replace the "cassette" assembly that attaches to  the pump in the printer. Replacement cassettes are supplied in the printer  Start-up Kit. Additional cassettes can be ordered from your Stratasys service  provider. To replace the waste pump tubes: 1.  Make sure that the printer is in Idle mode (see the figure on page 4-3). Note: The printer enters Idle mode about 16 minutes after printing stops. To force the printer into Idle mode, close the printer application: From the File menu, click Exit.
  • Page 99 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 5.  Identify the waste pump that requires tube replacement. Figure 4-121 Waste pumps 6.  Unscrew the fittings that connect the waste tubes to the pump. Figure 4-122 Disconnecting a pump tube 7.  Remove the part of the fitting remaining on the pump tube, and save it. DOC-08040 Rev. E 4-78...
  • Page 100 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 8.  When the tubes on both sides of the pump are disconnected, rotate the  pump "cassette" assembly counter-clockwise and remove it. Figure 4-123 Rotating the pump cassette 9.  Install a new pump cassette. The new cassette contains a new pumping tube. 10. Connect the waste tubes to the new pump cassette. 11. If necessary, replace the pump cassette on the other waste pump. 12. Open the Maintenance Counters screen, scroll down to the General Pumps section, and click Reset for the relevant counter(s) (see the figure   on page 4-28). 13. Connect the ground wire to the printer panel and attach the panel to the  printer. DOC-08040 Rev. E 4-79...
  • Page 101 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Replacing the Filters are installed in the line that supplies Vero PureWhite Model material   Vero to the print heads. To ensure that the heads remain in optimum condition,  PureWhite the filters should be replaced periodically. A counter keeps track of the  Material Filters amount of material passing through the filtered line, and the Maintenance Required indicator appears in the printer interface when it is time for filter  replacement. The counter is set for 15 hours—enough, on average, for about a  year of printing. To check the counter, open the Maintenance Counters  screen (see "Maintenance Counters" on page 4-26) and scroll down to the  Filters section. Figure 4-124 Maintenance Counters screen, showing material filters The figure above shows that five hours of filter time have passed since filters  were installed in the M5 slot location. Factory-installed filters for Vero PureWhite are in the M5 slot location.
  • Page 102 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 3.  Shut down the printer computer, wait 60 seconds after the monitor goes  blank, and turn off the main power switch. Caution: The monitor goes blank before the computer shuts down. Turning off the printer before computer shutdown can cause damage. 4.  Using an 8-mm hex (Allen) key, open the two latches that secure the back  of the materials cabinet and remove the back of the cabinet. 5.  Locate the Vero PureWhite filter/filters.
  • Page 103 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 6.  Continue with "Replacing a Single Filter" below or "Replacing Twin  Filters" on page 4-84. Replacing a Single Filter 1.  Put on protective gloves. Warning: Toxic and Corrosive Materials Prolonged contact with resins could cause skin irritation. Put on protective gloves before continuing.
  • Page 104 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 6.  Connect the INLET side of the new filter to the disconnected (left) tube. Figure 4-128 INLET side of the filter connected to the left tube Important: To connect the filter, hold the fitting at the end of the tube in place and turn the filter.
  • Page 105 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Replacing Twin Filters 1.  Put on protective gloves. Warning: Toxic and Corrosive Materials Prolonged contact with resins could cause skin irritation. Put on protective gloves before continuing. 2.  Detach the filter set from the bracket. Figure 4-129 Detaching the filter set 3. ...
  • Page 106 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 6.  On the new filter set, identify the side where the filters are marked  INLET. Figure 4-130 INLET side of the filter 7.  Connect the INLET side of the new filter set to the tube on the left side. Figure 4-131 Filter set attached on the left side Important: Before connecting the tube, turn the filter set towards you about 90°. When connecting the tube, hold the fitting at the end of the tube in place and turn the filter set back to the upright position.
  • Page 107 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 9.  Secure the filter set to the bracket.  Figure 4-132 Filter set secured to the bracket 10. Wipe the filters, tubes and surrounding area to remove material leaks and  spills.  11. Replace the back of the materials cabinet. 12. In the Maintenance Counters screen, click Reset and then Close (see  Figure 4-124 on page 4-80). Replacing the If the printer exhaust is not connected to an external ventilation system, a  Odor Filter built-in activated-carbon filter removes odors from printing materials. This  filter should be replaced regularly (as necessary) to keep your working  environment pleasant. This is normally done during the preventive- maintenance service visit.   Replacing the The UV lamps used for curing models have a long, but limited, working life. ...
  • Page 108 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Figure 4-134 Selecting the UV Lamp Replacement wizard 3.  Make sure that the build tray is empty, and confirm this in the wizard  screen. Then, close the printer, and click Next. Figure 4-135 Tray confirmation The axes move to the “home” position. 4.  Select the UV lamp(s) to be replaced and click Next. Figure 4-136 UV lamp selection screen DOC-08040 Rev. E...
  • Page 109 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 5.  Disconnect the UV-lamp power connector and the UV heat fuse  connector. Figure 4-137 Disconnecting the UV lamp Note: Do not disconnect the power connection to the cooling fans. 6.  Loosen the screw securing the UV lamp cover (A), and pull the cover up  (B), then out (C). Figure 4-138 Removing the UV lamp cover 7. ...
  • Page 110 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer 8.  Inspect the new UV lamp reflector, and make sure that a black strip is  attached to the inside of it. If not, install one—on the side of the reflector  opposite (not next to) the print block. Note: Extra black strips are included in the printer Start-Up Kit. If necessary, you can remove the black strip from the old reflector and install it in the new reflector (as long as the black paint has not faded).
  • Page 111 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Figure 4-141 Replacing the UV lamp cover 12. Reconnect the power and heat fuse connectors. Figure 4-142 Connecting the UV lamp 13. In the wizard screen, confirm that you have replaced the UV lamp(s) and  that the black strip is attached, then click Next. Figure 4-143 UV-installation confirmation DOC-08040 Rev. E 4-90...

  • Page 112: Testing And Calibrating The Uv Lamps 4

    Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer The wizard operates the UV lamps and checks if their power is within the  acceptable range for each printing mode.  Figure 4-144 Status during UV lamp check After replacing a UV lamp, it is recommended that you calibrate its power  for the various printing modes. The next screen allows you to continue to  the UV Calibration wizard (see "Testing and Calibrating the UV Lamps" on  page 4-64). Figure 4-145 Calibration selection screen DOC-08040 Rev. E 4-91...

  • Page 113: Built-In Tests 4

    Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Built-in Tests The printer application contains a suite of tests for regularly checking the  hardware and software, and for troubleshooting.  Because running the tests affects the operation of the printer, you can only  open the Built-in Tests interface when the system is not printing. The test suite features: • The organization of printing-related tasks in categories: ❒  Communications  ❒  Data cards  ❒  Temperatures  ❒  Voltages  ❒  Encoder repeatability  ❒  Print-head heating ❒  Print-head filling  • A clear display of test results and the source of any failures, enabling you  to determine if printing is possible or worthwhile.  • The ability to monitor test results for specific components. • Troubleshooting tips. Running these tests can help identify problems in the printer hardware and ...
  • Page 114 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer The Built In Tests screen lists pre-configured tests, grouped by component  categories. In this screen, you select and run tests, and the results are  displayed. Figure 4-147 Built In Tests screen Test Name Test List This column lists all of the tests, together with selection check boxes.  Click the check boxes to select the tests you want to run. To remove a  selection, click the check box again. To quickly select all of the tests in a  component category, use the Group drop-down list at the bottom of the  screen. Group This column shows the component categories for each test.  This tells you which tests are run when selecting a category from the Group  drop-down list at the bottom of the screen. Status This column shows the results of each test after you run it: Test successfully completed.
  • Page 115 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Test Selection Area In the Test Selection area, at the bottom of the screen, you can quickly select  or de-select tests by their characteristics: Click to select all of the tests in the list. None Click to de-select all of the tests in the list.
  • Page 116 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Close Click to close the Built-in Tests screen. Summary On the right side of the screen, a symbol represents the combined results of  all the tests run, using the symbols from the Status column. All tests successfully completed. At least one test failed. Not all tests performed. The following table lists the name of each test in the Built-in Tests suite,  Test together with its description and a possible reason for its failure. If you need  Descriptions and assistance, contact your Stratasys service provider. Troubleshooting  ...
  • Page 117 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Test Name Description Possible Reason for Failure Interlock Tests the interlock in the printer • Failure of interlock mechanism. cover. • Faulty latch. • Disconnected cable. Cabin Temperature Tests the temperature level in the Faulty temperature sensor (OHDB).
  • Page 118 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Replacing the Printer waste contains partially cured polymeric material, collected during  Waste normal operation and maintenance of the printer. For safety and  Container environmental reasons, this material is kept in a special leak-proof, disposable  container.  The container has a capacity of 10 kilograms of waste material—usually  enough for several months of printer use. The printer application displays a  warning message when there are 9 kilograms of material in the container,  and stops the printing when the net weight reaches 9.5 kilograms. Above 9  kilograms, the software does not allow you to start a printing job or activity  until you replace the waste container. You can monitor the weight of the  waste container in the Printer Indicators display in the printer interface. You  can also visually inspect the level of waste in the container. To access it, see  page 4-98. To monitor the waste weight (and other indicators) in the printer: ➢ ...
  • Page 119 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer The waste container consists of a plastic container inside a cardboard box.  You typically dispose of the entire waste container—including the box.  Therefore, you must assemble a new box and insert a new plastic container  before you can install it in the printer. Replacement boxes, plastic containers, and sealing caps are supplied in the J750 printer start-up kit and in the preventive-maintenance kit. To prepare a new waste container: 1. ...
  • Page 120 Stratasys J750 User Guide 4 Operating and Maintaining the Stratasys J750 3D Printer Cleaning the The painted exterior plastic panels of J750 3D printers have a durable finish,  Exterior Panels offering excellent chemical resistance to common cleaning materials. Follow  the recommendations below when cleaning these areas of the printer. Acceptable Cleaning Agents • mild soap solution  • common household cleaners and window cleaners • common commercial and industrial detergents, 5% solution in water  • alcohol (ethanol, isopropanol), 10% to 40% solution in water Wipe the exterior of the printer, using a soft cloth moistened with the  cleaning solution. Unacceptable Materials • industrial solvents  • cleaning agents containing hydrocarbons, ketones, esters and lacquer  thinners • spray disinfectants • abrasives and agents which could wear away the panel finish DOC-08040 Rev. E 4-99...

  • Page 121: Removing Models After Printing 5

    Handling Printed Models Removing Models After Printing Removing the Support Material Post-Printing Treatment for Models Made with VeroClear 5-5 Photo-Bleaching Instructions Storing Models DOC-08040 Rev. E...
  • Page 122 Stratasys J750 User Guide 5 Handling Printed Models Removing Models After Printing After printing models, you should allow them to cool as much as possible  before handling them. If additional models do not have to be produced on the  printer, it is best to let the printed models cool in the printer, with the cover  closed, as long as possible.  If the printer must be used to produce additional models as soon as possible: 1.  Let the printed models cool on the build tray for at least 10 minutes.  2.  Very carefully, remove the models from the tray with a scraper or spatula  (supplied in the tool kit), taking care not to pry or bend the model. Warning: Wear protective gloves when handling printed models before they are washed.
  • Page 123 Stratasys J750 User Guide 5 Handling Printed Models Removing While wearing protective gloves, break away excess Support material on the  Support Material outside of the model. For delicate models, use a toothpick, pin or small brush  by Hand after dipping the model in water.   • For SUP705, after breaking away excess Support material, soak the model  in a 1% caustic soda solution (see "Removing SUP705 with Caustic Soda"  on page 5-4). • For SUP706, after breaking away excess Support material, soak the model  in a 2% caustic soda and sodium metasilicate solution (see "Removing  SUP706 with Caustic Soda and Sodium Metasilicate" on the next page). Removing For most models, the most efficient way to remove Support material is by  Support Material using a high-pressure water jet. One suitable system is the Balco WaterJet  with Water cleaning unit. This device is marketed by Stratasys. Pressure Figure 5-1 Balco WaterJet Cleaning Unit To clean a model using this device, you place it in the chamber, and you  manipulate it and the jet using the built-in, waterproof sleeves. A pump turns ...
  • Page 124 Stratasys J750 User Guide 5 Handling Printed Models Removing Soak models in a 1-percent solution of caustic soda (sodium hydroxide) to  SUP705 with remove Support material from difficult-to-reach areas and to give the model a  Caustic Soda smooth, clean finish. The amount of time you soak the model in the solution  depends on how delicate it is and how much Support material needs to be  removed, but it is typically between half-an-hour and several hours. In any  case, you should remove as much Support material as possible before the  caustic soda treatment, and rinse the model thoroughly (with a water jet)  afterwards.  Warning Caustic soda may cause chemical burns, scarring and blindness. Mixing it with water generates heat that could ignite other materials. Never pour water into caustic soda.
  • Page 125 Stratasys J750 User Guide 5 Handling Printed Models Post-Printing Treatment for Models Made with VeroClear Models made with VeroClear (RGD810) have a slight yellow tint when  removed from the printer. This is especially true for models printed with a  glossy finish. The yellow tint fades naturally over time, but you can greatly  accelerate this process by using a suitable photobleaching treatment. As a rule, best clarity is achieved when parts are printed with a matte finish,  and treated as explained below. Photobleaching models involves exposing them to light. To achieve highly  controlled and predictable results, a professional illumination chamber is  recommended. However, adequate results may be obtained using ordinary  desk lamps fitted with suitable fluorescent elements. Figure 5-2 Left: Illumination chamber; Right: Desk lamps   Photo- Follow these instructions for photobleaching printed models. Bleaching • The fluorescent lamps should be rated 45W, 6500K. Instructions • When using desk lamps, place the models in a container lined with ...

  • Page 126: Storing Models 5

    Stratasys J750 User Guide 5 Handling Printed Models Storing Models Models are cured as they are printed, making them safe and stable for a long  time. However, proper storage conditions are necessary to prevent deforming. • Keep printed models at room temperature and in a low-humidity  environment. • Do not expose models to direct sunlight and other heat sources. DOC-08040 Rev. E...

Table of Contents