Stratasys J750 User Manual
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Stratasys J750 User Manual

3d printing system
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User Guide
Stratasys J750/J735/J720
3D Printing System
DOC-08040 Rev. R

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  • Page 1 User Guide Stratasys J750/J735/J720 3D Printing System DOC-08040 Rev. R...
  • 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 This product is covered by one or more of the following U.S. patents and other granted or pending patents. 6,569,373 7,209,797 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 7,991,498 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 R February 2021 DOC-08040 Rev. R...

  • Page 4: Table Of Contents

    1 About This Guide Using This Guide For More Information Revision History Terms Used in This Guide Additional Resources Stratasys Academy Stratasys Support Center GrabCAD Community 2 Safety Safety Features Symbols and Warning Labels Safety Guidelines Printer Installation Printer Operation...
  • Page 5 Workstation Requirements 4 Operating and Maintaining the Printer Starting the Printer Loading Model and Support Cartridges Producing Models Preparing the Printer Starting Printing Printer Interface Color Key Printing Indicators Resuming Production After Printing has Stopped 4-10 Changing the Printing Material 4-13 Changing Model Materials Without Flushing 4-19...
  • Page 6 Built-in Tests 4-119 Replacing the Waste Container 4-125 Cleaning the Exterior Panels 4-127 Cleaning the UV Screen 4-127 5 Handling Printed Models Removing Models After Printing Removing the Support Material Removing Support by Hand Removing Support with Water Pressure Removing SUP705 with Caustic Soda Removing SUP706 with Caustic Soda and Sodium Metasilicate Post-Printing Treatment Photobleaching for Transparent Models...
  • Page 7 About This Guide Using This Guide For More Information Revision History Terms Used in This Guide Additional Resources Stratasys Academy Stratasys Support Center GrabCAD Community DOC-08040 Rev. R...

  • Page 8: About This Guide

    Important: Read the entire Safety chapter before using the system. The text and figures in this guide are based on the J750 3D printer, software version D121_85.1. They also apply to J735 and J720 printers.

  • Page 9: Revision History

    Stratasys J750/J735/J720 User Guide 1 About This Guide Revision History The following table lists the main changes in each revision of this document. Revision Release Date Description Rev. Q February 2021 • About this Guide was updated. • Additional Resources was added.

  • Page 10: Terms Used In This Guide

    A build tray containing objects, each of which is designed to be printed using a different model material. Model material Material used for building models. Printer The computer inside the J750/J735/J720 printer that operates it. computer Printer The GUI (graphical user interface) used for controlling J750/J735/J720 interface printers.

  • Page 11: Additional Resources

    Stratasys J750/J735/J720 User Guide 1 About This Guide Additional Resources Stratasys encourages you to learn more about your additive manufacturing printer, its capabilities and the technology. A wealth of information is available on our online digital platforms. Stratasys Academy Stratasys Academy is your online learning platform.

  • Page 12: Stratasys Support Center

    The site also has links to Web-based training, "how-to" videos and the Stratasys blog. In addition, you can check the latest revision of the user guide for your printer, and download documents in different languages.

  • Page 13: Safety

    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.

  • Page 14: Safety Features

    Stratasys J750/J735/J720 User Guide 2 Safety Safety Features Stratasys 3D printers are designed to comply with CE and FCC standards. They are equipped with the following safety features: Interlock Switch The power supplied to the UV lamp, the tray heater and the motion motors is turned off when the cover is opened.

  • Page 15: Symbols And Warning Labels

    Stratasys J750/J735/J720 User Guide 2 Safety UV-Lamp Overheating Protection The power supplied to the UV lamp and the motion motors is turned off if the temperature around the lamp reaches 90°C (194°F). A label on the UV-lamp cover indicates if the temperature has exceeded 65°C (150°F).

  • Page 16: Safety Guidelines

    Stratasys J750/J735/J720 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.

  • Page 17: Uv Radiation

    The UV lamps used in the printer emit dangerous radiation ➢ If the UV lamps remain on when the printer is open, do not stare directly at the UV light. Shut down the printer and call your Stratasys service provider. Printer Maintenance ➢...

  • Page 18: Uv Lamps

    Stratasys J750/J735/J720 User Guide 2 Safety ➢ Dispose of contaminated shoes, belts and other leather items in accordance with any applicable regulations. Absorbed printing material may re-expose the user when these items are worn. UV Lamps UV lamps used by the printer to cure printing materials contain a small amount of mercury.

  • Page 19: First Aid For Working With Printing Materials

    Stratasys J750/J735/J720 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.

  • Page 20: Inhalation

    Stratasys J750/J735/J720 User Guide 2 Safety Inhalation Vapors from printing materials can be irritating to the respiratory system. If respiratory irritation occurs, expose the victim to fresh air immediately. ➢ If the victim has stopped breathing, perform artificial respiration or cardiopulmonary resuscitation.

  • Page 21: Introducing The 3D Printer

    Introducing the 3D Printer Basic Features Work Configurations Source Files Printing Materials Storage Shelf Life Exposure to Light Safety Considerations Disposal Work Environment Workstation Requirements DOC-08040 Rev. R...

  • Page 22: Basic Features

    Stratasys J750/J735/J720 User Guide 3 Introducing the 3D Printer Basic Features Stratasys J750/J735/J720 printers offer the following options: • You can 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...

  • Page 23: Work Configurations

    3 Introducing the 3D Printer Work Configurations Stratasys J750/J735/J720 3D printing systems can be set up as single-station systems or as multi-station systems. When connected to a local computer network, the system can serve multiple users. In such configurations, each user (client) prepares files for production.

  • Page 24: Source Files

    Print supports 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/J735/J720 systems feature the capability of producing different types of model files simultaneously. DOC-08040 Rev. R...

  • Page 25: Printing Materials

    For up-to-date information about PolyJet printing materials and their properties, go to www.stratasys.com/materials/polyjet. Storage Materials used for printing models with J750/J735/J720 printers are made of resins, 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.

  • Page 26: Safety Considerations

    Work Environment Extreme heat and humidity conditions can adversely affect the operation of your J750/J735/J720 3D printer. Use ventilation or air-conditioning systems, if necessary, to keep the work area within the following ranges: • 18°–25° C (64°–77° F) •...

  • Page 27: Operating And Maintaining The Printer

    Operating and Maintaining the Printer Starting the Printer Loading Model and Support Cartridges Producing Models Preparing the Printer Starting Printing Printer Interface Color Key Printing Indicators Resuming Production After Printing has Stopped 4-10 Changing the Printing Material 4-13 Changing Model Materials Without Flushing 4-19 Printing With Bio-Materials 4-21...
  • Page 28 Cleaning the Print-Head Splash Shield 4-54 Optimizing (Calibrating) Print Heads 4-56 Replacing Print Heads 4-63 Testing and Calibrating the UV Lamps 4-73 Calibrating the Load Cells 4-81 Flushing the Print-block Heater 4-82 Replacing the Waste-Pump Tubes 4-88 Replacing the Material Filters 4-93 Replacing the Odor Filter 4-96...

  • Page 29: Starting The Printer

    Chapter 2. 1. Turn on the main power switch, located at the back of the printer. Figure 4-2 Main power switch and cable The main power switch turns on the J750/J735/J720 printer, which includes the built-in computer. DOC-08040 Rev. R...
  • Page 30 4 Operating and Maintaining the Printer 2. After the printer-control computer boots, log in to Windows and launch the printer-control program: ❒ On the printer-computer desktop, double-click the J750/J735/J720 printer icon. or— ❒ From the Windows Start menu, select (All) Programs > Objet >...

  • Page 31: Loading Model And Support Cartridges

    4 Operating and Maintaining the Printer Loading Model and Support Cartridges Stratasys J750/J735/J720 printers use up to 12 cartridges of Model material and up to four cartridges of Support material, each weighing 3.6 kilograms when full. A graphical representation of the cartridges loaded and their current weight...

  • Page 32: Producing Models

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the 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.

  • Page 33: Starting Printing

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the 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 Starting Printing To begin printing: ➢...

  • Page 34: Printer Interface Color Key

    J750/J735/J720 printers use up to six different Model-material cartridges to produce models. In addition, two Support-material cartridge are required. If additional cartridges are installed and they are not immediately needed for printing, the printer interface indicates this (see "Printer Interface Color Key"...

  • Page 35: Printing Indicators

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Printing Indicators The printer interface screen changes when you send a print job to the printer, if the printer is online: • The mode changes from Pre-print to Printing. • The specific activity being performed is shown in the “current activity” field.

  • Page 36: Resuming Production After Printing Has Stopped

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the 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.
  • Page 37 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 6. In GrabCAD Print, make sure that the correct slice number is entered in the dialog box. Figure 4-8 Slice confirmation in GrabCAD Print Figure 4-9 Printer interface after interrupted printing 7.
  • Page 38 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer stoppage depend on the model size and structure, the Model material used, ambient temperature and the length of the stoppage. If you cannot continue printing: 1. Cancel the job. In GrabCAD Print, in the Schedule screen (see above): ❒...

  • Page 39: Changing The Printing Material

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the 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.
  • Page 40 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer When SUP705 Support material is loaded, Digital Anatomy materials cannot be used. To print Digital Anatomy models, use SUP706 Support material. 4. Choose the configuration for producing models: ❒ 6 materials ❒...
  • Page 41 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 3 Materials Both sections of each print head are loaded with the same material. Figure 4-13 Three materials loaded in the print heads Up to three Model materials are available, with high-speed printing.
  • Page 42 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 9. To flush out material currently in the system, choose the flushing cycle that fits your needs: The default flushing cycle is the one used for the last material replacement.
  • Page 43 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 10. Click Next to begin the material replacement process in the printer. The Cartridge Positioning screen appears, showing you the new location of all cartridges in the material cabinet. Figure 4-14 Cartridge placement Symbols: The correct cartridge is in this slot.
  • Page 44 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Figure 4-15 Final wizard screen 14. In the final wizard screen, click Done. The printer-control application is automatically updated, and it restarts. When it opens, the interface displays the new material(s).

  • Page 45: Changing Model Materials Without Flushing

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the 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.
  • Page 46 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 4. In the confirmation message that appears, click Yes to continue. Figure 4-18 Replace without flushing confirmation message 5. In the Cartridge Positioning and Process Progression screen, click Start. Figure 4-19 Cartridge Positioning and Process Progression screen 6.

  • Page 47: Printing With Bio-Materials

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Printing With Bio-Materials To ensure the bio-compatibility of printed parts when changing from standard printing materials to bio-compatible materials, follow the instructions for loading the relevant material. To download the required document, search for "Biocompatibility Requirements"...
  • Page 48 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 3. In the Material Replacement Options screen, Both cartridges is selected for each position. To print with only one of the cartridges, clear the check box and then select either the left (L) or the right (R) cartridge.
  • Page 49 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 4. After selecting the materials for the appropriate cartridge slots, the Cartridge Positioning screen appears. Place the cartridges in the materials cabinet as shown in this screen. Additional Flushing Cycles The flushing cycle you select in the Material Replacement Options screen determines how thoroughly to flush out material currently in the system.

  • Page 50: Keeping The Printer In Idle Mode

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Keeping the Printer in Idle Mode Between printing jobs, the printer can be left unused for up to one week. If the printer will not be used for more than a week, use the Shutdown wizard to automatically perform the procedures that must be done before turning off the printer (see "Shutting Down the Printer"...

  • Page 51: Setting The Cartridge Expiration Alert

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Setting the Cartridge Expiration Alert The printer application records the expiration dates for each loaded cartridge. You can display the Cartridge Expiration Date screen from the Options menu. Figure 4-25 Options menu...
  • Page 52 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Figure 4-27 Cartridge expiration alert indicator in main screen If this cartridge expiration indicator appears, you can display the Cartridge Expiration Date screen by clicking on it. To change the cartridge expiration alert at an earlier or later time, in the Cartidge Expiration Alert screen, enter the desired number of days, and click Save.

  • Page 53: Shutting Down The Printer

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Shutting Down the Printer You only need to shut down the printer if it will not be used for 30 days or more. Otherwise, the printer can remain on, in Idle mode. However, if there is a need to...
  • Page 54 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 2. Click Next. 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.
  • Page 55 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 4. In the next screen, verify that the tray is empty and click Next. Figure 4-30 Tray status The shutdown procedure begins. Figure 4-31 Shutdown progress 5. Follow the instructions until cleaning is completed.
  • Page 56 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 6. When the final wizard screen appears, close the printer-control application and shut down the printer computer. Figure 4-32 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 4-3).

  • Page 57: Maintaining The Printer

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Maintaining the Printer Performing routine maintenance tasks is essential for getting satisfactory results from your printer. Perform the tasks at specified intervals. Routine Maintenance Schedule Frequency Task For More Information Before printing Clean the UV lamp lenses.

  • Page 58: Maintenance Counters

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Frequency Task For More Information Monthly, and after replacing print Check the alignment of the print heads. See "Aligning the heads Print Heads" on page 4-49. Monthly Remove and clean the print-head splash shield.
  • Page 59 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer If there is a maintenance task due, this is indicated on the main interface screen. Figure 4-34 Maintenance Required indicator If this indicator appears, you can display the Maintenance Counters screen by clicking on it.

  • Page 60: Uv Lamp Check

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer UV Lamp Check A heat-sensitive label is fixed to the UV lamp covers as a warning against overheating. Its center changes from white to black if the temperature of the cover reaches 65°C (150°F).
  • Page 61 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Figure 4-37 Selecting Pattern Test 5. Click Yes in the Confirm dialog box to begin. Figure 4-38 Pattern Test confirmation 6. If the build tray is not clear, click No in the following dialog box.
  • Page 62 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer The printer prints a series of lines on the test paper (see next figure). Figure 4-40 Sample Pattern Test 7. Carefully inspect the test paper to see if there are missing lines.

  • Page 63: Backing Up The Printer Configuration

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Backing up the Printer Configuration It is recommended that you periodically back up the printer's configuration files. In case of printer malfunction or the need to re-install the software on the printer computer, parameters can be restored from the backup.

  • Page 64: Improving Print Quality

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Improving Print Quality If you suspect that print quality is poor, perform the Pattern Test (see "Pattern Test" on page 4-34). If the results are poor, use the following procedure to improve print quality.
  • Page 65 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer To clean the printer components: 1. Prepare— ❒ 90% isopropanol (IPA—isopropyl alcohol) or ethanol (ethyl alcohol) ❒ disposable cleaning gloves ❒ a supplied 3M sanding sponge ❒ a supplied cleaning cloth or equivalent ❒...
  • Page 66 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 4. When the following screen appears, open the printer. Figure 4-44 Wizard screen during cleaning tasks 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 67 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 8. Clean the orifice plates, with a back-and-forth motion. Use the mirror to make sure that you have removed all of the residue material. Figure 4-45 Cleaning the heads Once a month, remove and clean the print-head splash shield. (See step 4 on page 4-55.)
  • Page 68 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Note: When returning the waste collector to the purge unit, make sure to insert it as shown. 12. Inspect the wiper. If the wiper is scratched, torn or worn, or if you cannot clean it completely, replace it.

  • Page 69: Cleaning The Roller Waste Collector And Inspecting The Roller Scraper

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 16. When the roller is clean, select the confirmation check box in the wizard screen and click Next. Figure 4-48 Clean-roller confirmation The roller stops rotating when you click Next.
  • Page 70 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer To clean the roller waste collector: 1. Prepare— ❒ M2.5 and M2 Hex (Allen) keys ❒ disposable cleaning gloves ❒ 90% isopropanol (IPA—isopropyl alcohol) or ethanol (ethyl alcohol) ❒ cleaning cloth ❒...
  • Page 71 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 5. Loosen the two screws securing the suction tube on the print block. Figure 4-51 Lifting the suction tube 6. Lift the suction tube to secure it in a raised position.
  • Page 72 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 9. Clean the roller waste collector and the scraper blade surface using cotton swabs. Make sure to remove any remaining printing materials. Figure 4-53 Cleaning the roller waste collector Before replacing the covering, you can check the effectiveness of the roller scraper—see below.

  • Page 73: Replacing The Roller Scraper

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 2. Loosen the screws securing the suction tube. Figure 4-55 Positioning the suction tube 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.
  • Page 74 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 4. Remove the screws that secure the roller scraper assembly. Figure 4-57 Removing the roller scraper screws 5. Remove the scraper blade and discard it. Figure 4-58 Removing the old roller scraper blade 6.

  • Page 75: Aligning The Print Heads

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 7. Insert and tighten the roller scraper blade screws. Important: Tighten the screws in the order shown in Figure 4-60. Use the new screws supplied in the replacement kit Figure 4-60 Tightening the roller scraper screws 8.
  • Page 76 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 3. When the following screen appears, place the transparency on the build tray—next to the left and rear edges of the tray (see below). Figure 4-61 Transparency confirmation Figure 4-62 Positioning the transparency on the build tray 4.
  • Page 77 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer The transparency sheet is printed with sets of vertical lines in seven columns, each showing the results from a different print head. Figure 4-64 Sample head-alignment test Note: There is no column for head H7 because its alignment is used as a reference for aligning all other heads.
  • Page 78 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 10. In the head-alignment screen, select the number that indicates which lines align in the upper and lower rows of a pair on the transparency (counting from the left) for this print head.
  • Page 79 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 13. In the following screen, you can choose to either repeat the head alignment procedure, continue to the Color Uniformity wizard, or close the wizard. Figure 4-68 Repeat head alignment option ❒...

  • Page 80: Cleaning The Print-Head Splash Shield

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Cleaning the Print-Head Splash Shield To prevent excess printing material from accumulating around the print heads, a splash shield is installed on the bottom of the print block. Remove the shield and clean it once a month, when cleaning the print heads (see "Cleaning the Print...
  • Page 81 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 4. Using a 2-mm hex (Allen) key, remove the screws to remove the splash shield. Figure 4-70 Print-head splash shield installed on the print block Figure 4-71 Removing the print-head splash shield Warning: Hot Surface The print head orifice plates (bottom surface) may be hot.

  • Page 82: Optimizing (Calibrating) Print Heads

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Optimizing (Calibrating) Print Heads The condition of the print heads directly affects the quality of printed models. To maintain optimum printing, you should routinely test the print heads, and calibrate them to the best working configuration possible by running the Head Optimization wizard every 300 hours of printing.
  • Page 83 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 2. Start the Head Optimization wizard from the Options menu. Figure 4-72 Starting the Head Optimization wizard 3. In the opening wizard screen, click Next to begin. The Wizard Conditions screen appears.
  • Page 84 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 6. In the following screen, make sure Optimize all print heads is selected, and click Next. Figure 4-74 Procedure selection screen 7. Select the printing mode for which you want to optimize the print heads and click Next.
  • Page 85 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 9. When the following screen appears, open the printer and tape a sheet of pink paper to the surface left of the build tray. Figure 4-77 Preparing for head optimization (2) When you click Next, the Pattern Test is printed on the pink paper.
  • Page 86 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 12. In the Missing Nozzles screen, enter the number of missing nozzles for each print head and click Next. 13. The wizard continues according to the number of missing nozzles you entered.
  • Page 87 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 15. 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. Then, the following screen appears.
  • Page 88 • 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 an authorized Stratasys service provider. DOC-08040 Rev. R 4-62...

  • Page 89: Replacing Print Heads

    ❒ Head Heater temperature timeout ❒ Head Heater thermistor open ❒ Head Heater thermistor short Replace print heads only after consulting with an authorized Stratasys service provider. The Head Optimization wizard guides you through the procedure of replacing a print head, and configures printer components to enable you to perform it. Only replace a print head with the aid of the wizard.
  • Page 90 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer The entire print-head replacement procedure takes about 45 minutes, and consists of the following phases: A. Identifying the head(s) needing replacement. This is normally done by the Head Optimization wizard. Otherwise, evidence of physical damage to the head surface or a malfunction message indicates which head needs replacing.
  • Page 91 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 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 4-86 Clean print heads screen 6.
  • Page 92 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 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.
  • Page 93 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 11. Loosen the screws that secure the driver-card bracket, and lower the bracket. Figure 4-91 Loosening the driver-card bracket screws 12. Release the driver-card support. Figure 4-92 Releasing the driver-card support DOC-08040 Rev.
  • Page 94 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 13. Remove the driver card by releasing the latch at the points shown. Figure 4-93 Releasing the driver-card latch 14. Release the upper and lower screws that secure the print head in the block.
  • Page 95 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the 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 4-95 Releasing the print head 16.
  • Page 96 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the 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 4-97 Making sure the O-rings are not stuck to the print block Installing the New Head 17.
  • Page 97 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 22. In the Replace print heads screen, select the check box to confirm that you have replaced the head(s), and click Next. Figure 4-99 Head replacement confirmation 23. With your fingers, make sure that the new head is level and even with the other heads.
  • Page 98 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 25. In the next wizard screen, confirm that you have removed all tools and objects from the printer. Figure 4-102 Cleared-tray confirmation screen 26. Close the printer cover. The wizard continues by heating the heads, then filling and purging them.

  • Page 99: Testing And Calibrating The Uv Lamps

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer ➢ If the replacement head was not calibrated by Stratasys, remove the head and replace it with another one. Figure 4-104 Invalid-head warning Contact your Stratasys service provider about the uncalibrated head.
  • Page 100 Figure 4-106 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 101 4. Make sure that the build tray is empty. Confirm this in the wizard screen and click Next. Figure 4-107 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.
  • Page 102 4 Operating and Maintaining the Printer UV Sensor Connected to Printer The following steps apply when using the Stratasys UV sensor box that you connect to the printer. They do not apply when using a UV external radiation measuring device.
  • Page 103 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 2. Click Next. The build tray lowers so you can connect the UV sensor box. Figure 4-110 UV sensor connector 3. Confirm the items listed in the wizard screen and click Next.
  • Page 104 External UV Meter The following steps apply when using a stand-alone UV meter. This section does not apply when using the Stratasys UV sensor box connected to the printer. 1. When the following screen appears, open the printer and place the UV sensor (probe) at the rear edge of the tray, in the center.
  • Page 105 Figure 4-114 UV measurement progress When using a stand-alone radiation meter (not the Stratasys UV sensor box connected to the printer): Reset the meter and enter the reading (measurement) when you are prompted to do so.
  • Page 106 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 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 4-116 below).

  • Page 107: Calibrating The Load Cells

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Figure 4-118 Final UV Calibration Wizard screen Calibrating the Load Cells Load cells are sensors that measure the weight of the material cartridges and the waste container in the printer. It is important that you periodically check that the weight measurements are accurate to prevent unnecessary waste of printing materials or printer malfunctions.

  • Page 108: Flushing The Print-Block Heater

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Figure 4-120 Weight stabilization 5. Select the check box, and click Next. 6. Click Done in the final wizard screen. Flushing the Print-block Heater If the printer is configured to print in High Speed mode, with three Model materials, the print-block heater needs to be periodically flushed.
  • Page 109 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer To flush the Print-block Heater: 1. From the Options menu, open the Material Replacement wizard. Figure 4-121 Opening the Material Replacement wizard 2. In the opening screen, click Next. 3. In the Material Replacement Options screen, click Advanced Settings.
  • Page 110 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Figure 4-123 Manual slot selection 5. When the Material Replacement Options screen opens again, select the following: ❒ 6 materials ❒ Economy Figure 4-124 Selections in the Material Replacement Options screen Make sure that the printer is loaded with the selected materials.
  • Page 111 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 7. In the Cartridge Positioning screen, make sure that the material cartridges are properly positioned. Figure 4-125 Cartridge Positioning screen Symbols: The correct cartridge is in this slot. No cartridge (or the incorrect cartridge) is in this slot.
  • Page 112 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Figure 4-126 Wizard Completed screen 10. Click Done. The printer-control application restarts, and it is now in High Mix / High Quality mode, using all six material loaded in the printer.
  • Page 113 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Note: The time needed to complete this process depends on the materials currently loaded in the printer. The estimated time is displayed at the bottom of the Cartridge positioning screen.

  • Page 114: Replacing The Waste-Pump Tubes

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Replacing the Waste-Pump Tubes The tubes that pump waste material from the roller waste collector and the purge unit should be replaced after 1000 hours of use. After this time, a counter displays a maintenance alert on the printer interface screen.
  • Page 115 To replace pump tubes, you replace the entire pump "cassette" 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 4-4).
  • Page 116 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 5. Identify the waste pump that requires tube replacement. Figure 4-133 Waste pumps 6. Unscrew the fittings that connect the pump waste tubes, and separate the tubes. Figure 4-134 Disconnecting pump tubes 7.
  • Page 117 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 8. Pull out the white restraining clip to release the pump. Figure 4-135 Releasing the pump 9. When the tubes on both sides of the pump are disconnected, rotate the pump "cassette"...
  • Page 118 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 10. Holding a new pump cassette with one hand, gently pull on each of the tubes. Pulling on the tubes before installing the cassette ensures that the pump mechanism turns freely.

  • Page 119: Replacing The Material Filters

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Replacing the Material Filters Filters are installed in the lines that supply Model material to the print heads. To ensure that the heads remain in optimum condition, the filters are replaced by your service provider, as part of the scheduled maintenance routine.
  • Page 120 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 2. Close the printer application. 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 as soon as the remote desktop link terminates—...
  • Page 121 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 10. Identify the inlet side of the new filter. This is the side showing the part number. A 6mm tube is connected to the inlet. (An 8mm tube is connected to the outlet.)

  • Page 122: Replacing The Odor Filter

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 17. In the Maintenance Counters screen, click Reset and then Close (see Figure 4-138 on page 4-93). Replacing the Odor Filter If the printer exhaust is not connected to an external ventilation system, a built-in activated-carbon filter removes odors from printing materials.
  • Page 123 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 2. Start the UV Lamp Replacement wizard from the Options menu. Figure 4-142 Selecting the UV Lamp Replacement wizard 3. Make sure that the build tray is empty, and confirm this in the wizard screen.
  • Page 124 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 4. Select the UV lamp(s) to be replaced and click Next. Figure 4-144 UV lamp selection screen 5. Disconnect the UV-lamp power connector and the UV heat fuse connector. Figure 4-145 Disconnecting the UV lamp Note: Do not disconnect the power connection to the cooling fans.
  • Page 125 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 6. Loosen the screw securing the UV lamp cover (A), and pull the cover up (B), then out (C). Figure 4-146 Removing the UV lamp cover 7. Pull the UV reflector out of the UV housing.
  • Page 126 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 9. Remove the UV lamp bulb from the UV reflector. Figure 4-149 Removing the UV lamp bulb 10. Before continuing, inspect the spring-loaded pins. If there are burn marks around the pins or if the pins are loose—their springs are not functioning properly—and do not support the bulb, continue with step...
  • Page 127 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 11. Using the polyurethane tube provided in the kit, push the new UV lamp bulb into the UV reflector. Make sure that the tip on the bulb is facing the slot.
  • Page 128 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 13. Use the UV lamp clamp to insert the lamp into place in the UV reflector. Figure 4-153 Pushing the UV lamp into place 14. Using a 2.5-mm hex key, secure the clamp to the UV reflector, and continue...
  • Page 129 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Warning: Broken UV lamp hazard UV lamps contain mercury. Deal with broken lamps with caution. Ventilate the room thoroughly. Use protective gloves when collecting mercury and lamp components. Remove spilled mercury with a method that prevents the generation of mercury vapor, such as a syringe, packing tape or paper.
  • Page 130 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 19. Reconnect the power and heat fuse connectors. Figure 4-157 Connecting the UV lamp 20. In the wizard screen, confirm that you have replaced the UV lamp(s) and that the black strip is attached, then click Next.
  • Page 131 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer The wizard operates the UV lamps and checks if their power is within the acceptable range for each printing mode. Note: The mode currently being checked appears in the lower-left corner of the printer interface.

  • Page 132: Improving Color Uniformity Of X-Walls

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Improving Color Uniformity of X-Walls During the printing process, the alignment of the print heads can adversely affect the color uniformity of the model’s X-walls. The non-uniformity is more noticeable when the model’s left and right X-walls need to be matched after printing.
  • Page 133 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer ❒ 90% isopropanol (IPA—isopropyl alcohol) or ethanol (ethyl alcohol) ❒ a computer running GrabCAD Print (preferably the computer that sends print jobs to the printer) ® ❒ the Color Uniformity Utility (a MATLAB Environment may also be required if not installed).
  • Page 134 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Figure 4-163 Fixing the transparency to the tray 7. Secure the transparency sheet with tape to the tray. 8. Using a clean cloth, wipe Zyvax Watershield over the entire transparency.
  • Page 135 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 9. In the following screen, confirm the items in the wizard screen, and click Next. Figure 4-165 Confriming transparency readiness A test pattern is printed on the transparency. This takes approximately 10 minutes.
  • Page 136 After printing the test pattern on a transparency, you scan it twice. In addition, you scan the reference (grid) transparency twice. Use the scanner currently recommended by Stratasys. The illustrations in this section show the Canon CanoScan LiDE 400 interface.
  • Page 137 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 3. Select the Advanced Mode tab. 4. Make sure that these settings are as follows: ❒ Color Mode: Color ❒ Output Resolution: 1200 dpi ❒ All field under Image Settings: None or OFF Figure 4-169 Advanced Mode settings DOC-08040 Rev.
  • Page 138 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 5. Place the test-pattern transparency face up on the scanner platen, with the arrows aligned with the black rail (under the glass), and the edge marked 'This Face Up - A' along the bottom edge of the scanner glass (closest to you).
  • Page 139 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 9. With the cursor, adjust the cropping frame (scan area) so that it surrounds the printed pattern shown below. Figure 4-172 Adjusting the cropping frame (scan area) 10. Click Scan.
  • Page 140 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 11. When scanning is finished, select Scan other images in the dialog box and click OK. Figure 4-173 Selection after scanning the test pattern If this dialog box does not appear, click Preferences (at the bottom of the interface) and in the Scan tab, select Display the dialog to select next action.
  • Page 141 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 20. When scanning is finished, select Retouch and save the image in the dialog box and click OK. Important: Save the images as JPG files. Figure 4-174 Selection after scanning the reference transparency 21.
  • Page 142 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Analyzing the Transparencies After scanning the test pattern and the reference grid, you analyze them in the Color Uniformity Utility, and the pixel correction values are calculated. To analyze the scanned transparencies: 1.
  • Page 143 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 5. On the printer, in the following wizard screen, enter each of the corrections values that appear in the utility in the ¼ Pixel column. Figure 4-177 Enter Pixel Correction screen in wizard 6.

  • Page 144: Dynamic Nozzle Test

    Many gaps in the sample indicates that many nozzles in the print head are not functioning. This might indicate the need to replace the defective head. In this case, consult with your Stratasys service provider. Samples printed from certain Model materials in this test might not be completely cured.

  • Page 145: Built-In Tests

    A large number of hardware defects (or near-defects) warns you of possible printing problems, either for current or future jobs. Stratasys recommends running the built-in tests in the following cases: as a routine test, once every two weeks as a system check, before major (long) jobs as needed, for troubleshooting DOC-08040 Rev.
  • Page 146 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer To open the Built-in Tests screen, do one of the following: • From the Options menu, select Built-In Tests. • Press Ctrl+Alt+B. Figure 4-181 Selecting Built-In Tests from the Options menu The Built In Tests screen lists pre-configured tests, grouped by component categories.
  • Page 147 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Test List Test Name 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.
  • Page 148 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Test Results To save and view a report of all tests: ➢ Use the Save and View command buttons. Command Buttons Click the command buttons, on the right side of the screen to perform the following operations: Click to run the selected tests.
  • Page 149 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the 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.
  • Page 150 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Test Name Description Possible Reason for Failure Head/Block Heaters Tests the heaters in the print heads Faulty heaters or thermistors. and in the print-block body. System Voltages Checks if the following voltages are •...

  • Page 151: Replacing The Waste Container

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Replacing the Waste Container Printer waste contains partially cured polymeric material, collected during normal operation and maintenance of the printer. For safety and environmental reasons, this material is kept in a special leak-proof, disposable container.
  • Page 152 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the 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.

  • Page 153: Cleaning The Exterior Panels

    Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer 9. Close the waste compartment door. Dispose of the full waste container in accordance with environmental and safety requirements. Cleaning the Exterior Panels The painted exterior plastic panels of the printer has a durable finish, offering excellent chemical resistance to common cleaning materials.
  • Page 154 Stratasys J750/J735/J720 User Guide 4 Operating and Maintaining the Printer Do not use paper towels, which can cause scratch marks. 4. Thoroughly wet the surface with the cloth. Do not wipe! 5. Rinse the cloth with clean water. 6. Absorb the solution from the acrylic surface with the cloth, without applying pressure.

  • Page 155: Handling Printed Models

    Handling Printed Models Removing Models After Printing Removing the Support Material Removing Support by Hand Removing Support with Water Pressure Removing SUP705 with Caustic Soda Removing SUP706 with Caustic Soda and Sodium Metasilicate Post-Printing Treatment Photobleaching for Transparent Models Storing Models DOC-08040 Rev.

  • Page 156: Removing Models After Printing

    Stratasys J750/J735/J720 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.

  • Page 157: Removing Support By Hand

    For most models, the most efficient way to remove Support material is by using a high-pressure water jet. One suitable system is the Balco WaterJet cleaning unit. This device is marketed by Stratasys. Figure 5-1 Balco WaterJet Cleaning Unit To clean a model using this device, you manipulate it and the water using the built-in, waterproof sleeves.

  • Page 158: Removing Sup705 With Caustic Soda

    Stratasys J750/J735/J720 User Guide 5 Handling Printed Models Removing SUP705 with Caustic Soda Soak models in a 1-percent solution of caustic soda (sodium hydroxide) to remove Support material from difficult-to-reach areas and to give the model a 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.

  • Page 159: Post-Printing Treatment

    Photobleaching methods and instructions are described in the Best Practices for the relevant clear material. These are available on the Transparent materials page on the Stratasys Support Center. Refer to the Best Practices for: VeroClear RGD810 VeroUltra Clear RGD820...

This manual is also suitable for:

J735J720

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