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Step 7 - Installing the xReflector sticker (xLCD A)
Step 13 - What's left... (xLCD A)
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Related Manuals for Original Prusa MK4
Summary of Contents for Original Prusa MK4
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Page 1: Table Of Contents
Step 2 - Removing the xLCD assembly ................Step 3 - Disassembling the xLCD ..................Step 4 - MK4: xLCD versions ............. Step 5 - xLCD A: parts preparation (part 1) ............Step 6 - xLCD A: parts preparation (part 2) .......... - Page 2 ......................Step 14 - xLCD B ............Step 15 - xLCD B: parts preparation (part 1) ............Step 16 - xLCD B: parts preparation (part 2) ..........Step 17 - Installing the xReflector sticker (xLCD B) ............... Step 18 - Installing the M3n nut (xLCD B) ............
- Page 3 ..............Step 42 - Attaching the Fan-door-cover ............... Step 43 - Connecting the extruder cables ................Step 44 - LoveBoard: Wiring check ........... Step 45 - Covering the LoveBoard: parts preparation ............Step 46 - Covering the LoveBoard: side cover ............
- Page 4 .................. Step 5 - Assembling the Wi-Fi ............Step 6 - Installing the WiFi cover assembly .............. Step 7 - NFC antenna: parts preparation I............. Step 8 - NFC antenna: parts preparation II............. Step 9 - Installing the NFCcoil (pre-assembled) ..............
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Page 5: Introduction
1. Introduction Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 6: Step 1 Upgrade Manual Info
MK4S logos across the manual. STEP 2 Preparing the upgrade kit Please prepare the upgrade kit received from Prusa Research. MMU3: This manual also includes instructions for MMU3 owners. These instructions are separated and indicated in advance. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 7: Step 3 What Will Be Upgraded
1. Introduction STEP 3 What will be upgraded? MK4/MK3.9 upgrade to MK4S/MK3.9S includes changes to: New Y-axis tensioning mechanism printed from PCCF material for greater heat resistance. New injection molded xLCD cover. It is compatible with certain xLCD board versions. In case of incompatibility, a new printed cover will be provided—more information is in the relevant chapter... -
Page 8: Step 4 Getting The Necessary Tools
1. Introduction STEP 4 Getting the necessary tools Use the tools that came with your MK4/MK3.9 printer. For this upgrade you will need: 2.5mm Allen key Torx key T6 Torx key T10/8 Wrench 13-16 Universal wrench Brass brush for cleaning the hotend... -
Page 9: Step 6 Printed Parts - Versioning
Lost in the instructions, missing screw or cracked printed part? Let us know! You can contact us using the following channels: Using comments under each step. Using our 24/7 live chat here at help.prusa3d.com Writing an email to info@prusa3d.com Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 10: Step 8 Pro Tip: Inserting The Nuts
When you browse the guide on help.prusa3d.com, you can view the original images in high resolution for clarity. Just hover your cursor over the image and click the Magnifier button ("View original") in the top left corner. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 11: Step 10 Important: Electronics Protection
Be extra cautious in rooms with carpets, which are often a source of electrostatic energy. Clothes made of wool or certain synthetic fabrics can easily gather static electricity too. It is safer to wear cotton clothing for the assembly. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 12: Step 11 - How To Successfully Finish The Assembly
Use a reasonable force, the printed parts are tough, but not unbreakable. If it doesn't fit, check your approach twice. Most important: Enjoy the build, have fun. Cooperate with your kids, friends or partners. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 13: Step 12 Prepare Your Desk
MK4 version. CAUTION: Always compare the new parts with the provided pictures to avoid confusing them with the old parts. NOTE: For visually similar parts, we will always notify you when new parts are involved. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 14: Step 14 Cleaning The Hotend
When the heaterblock and the hotend are perfectly clean, cool down the printer. On the screen, navigate to Preheat -> Cooldown. Wait until the hot parts are cooled down to ambient temperature. It takes approximately 10 minutes. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 15: Step 15 Reward Yourself
Reward yourself Based on the feedback, building the MK4S/MK3.9S printer is even more enjoyable compared to the MK4. However, you should still treat yourself for every finished chapter. Look in the box and find a bag of Haribo Bears. The biggest issue from our experience (MK4, MK3S+, MK3S, MK3, MK2S, ...) is inadequate bear consumption. -
Page 16: Step 17 Mmu3 Preparation
1. Introduction STEP 17 MMU3 preparation This step is only for the MK4/MK3.9 + MMU3 users! Disconnect the PTFE tube fitting from the Nextruder. Remove the MMU3 unit from the printer and set it aside. We will re-install it later Carefully cut off the zip-tie holding the MMU-Printer cable on the MMU unit. -
Page 17: Upgrading The Y-Axis
2. Upgrading the Y-axis Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 18: Step 1 Y-Axis Parts Info
In this chapter, you will upgrade the old Y-axis belt tension mechanism with new parts printed from PCCF material. The latest MK4 units might already include Y-axis parts upgraded to PCCF. If your printer has these, you can skip this chapter. -
Page 19: Step 3 Preparing The Printer
Remove the belt with the GT2-20 pulley from the Y-belt idler, and then take it out of the printer. Be careful not to lose the pin from the pulley. You will need it again later on. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 20: Step 5 Removing The Y-Belt-Holder
Y belt (1x) you removed earlier M3nN nut (1x) new one M3x40 screw (1x) you removed earlier M3x10 screw (4x) you removed earlier GT2-20 pulley (1x) you removed earlier Pin H8 2.9x20 (1x) you removed earlier Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 21: Step 7 Assembling The Y-Belt-Holder
Insert the M3x10 screw through the hole in the Y-belt-holder. Take one of the Y belt ends and push it into the Y-belt-holder. Note the orientation of the belt (teeth). Secure it by inserting and tightening one M3x10 screw. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 22: Step 9 Attaching The Y Belt Holder
Insert the belt with the pulley into the Y-belt-idler on the rear of the front plate. Push the pulley all the way inside the printed part and lightly pull on the belt to lock the pulley in place. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 23: Step 11 Attaching The Y Belt Tensioner
Tighten the screw to bring the parts closer together and increase the tension. Release the screw to move the parts apart to decrease the tension. After you set the correct belt tension, tighten up the M3x10 screw on the bottom to fix the Y-belt-tensioner in place. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 24: Step 13 Belt Tension Check
Please state your brand and model in the comments below the step. STEP 14 What's left... At the end of each chapter, we'll show you which parts you have left. You will no longer need these parts: Old Y-belt-holder (1x) Old Y-belt-tensioner (1x) Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 25: Step 15 Haribo Time
The exact dosage is absolutely critical!!! Eat one gummy bear. I said just one! STEP 16 Done You've successfully upgrade your Y- axis belt mounting system. Let's move to the next chapter 3. Upgrading the xLCD Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 26: Upgrading The Xlcd
3. Upgrading the xLCD Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 27: Step 1 Tools Necessary For This Chapter
The position of the PE Faston cable may vary depending on your xLCD version. Early units have the cable secured by a screw to the PE Faston connector. Carefully unplug the xLCD connector from the xLCD board. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 28: Step 3 Disassembling The Xlcd
Remove the xLCD-support-left (right from this view). Carefully remove the xLCD board from the cover together with the xLCD-support- right. Be careful not to damage the screen on the opposite side of the xLCD. Remove the xLCD-support-right from the xLCD. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 29: Step 4 Mk4: Xlcd Versions
A: parts preparation (part 1) For the following steps, please prepare: xLCD-support(1x) new part xLCD-cover (1x) new part xLCD (1x) you removed earlier xReflector sticker set (1x) The list continues in the next step... Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 30: Step 6 Xlcd A: Parts Preparation (Part 2)
"gutter" in the xLCD-cover. Continue to lay down the xReflector sticker strip towards the other side of the gutter. Press the xReflector sticker strip all the way into the gutter so it adheres to the xlcd- cover. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 31: Step 8 Covering The Xlcd (Xlcd A)
Through the opening in the xLCD-support, place the PE Faston on the xLCD with the exact orientation as shown. Center the PE Faston in the opening and secure it with the 3x8sT screw. The screw cuts thread directly into the plastic, so there might be some resistance. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 32: Step 10 Attaching The Knob (Xlcd A)
Make sure the xLCD cable is connected in the same orientation as seen in the picture. Otherwise, your display won't work Slide the connector onto the PE Faston all the way. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 33: Step 12 Mounting The Assembly (Xlcd A)
The screw cuts thread directly into the plastic, so there might be some resistance. STEP 13 What's left... (xLCD A) You will no longer need these parts: Old xLCD-cover (1x) xLCD-support-right (1x) xLCD-support-left (1x) Old xLCD-knob (1x) Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 34: Step 14 Xlcd B
A, skip these steps! For the following steps, please prepare: xLCD (1x) you removed earlier xLCD-cover (1x) new part xLCD-support-left (1x) you removed earlier xLCD-support-right (1x) you removed earlier Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 35: Step 16 Xlcd B: Parts Preparation (Part 2)
Peel the xReflector sticker off the protective layer. Apply it into the marked area on the inside of the new xLCD cover. Press the xReflector sticker strip all the way towards the xLCD-cover, so that it adheres properly. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 36: Step 18 Installing The M3N Nut (Xlcd B)
Insert the xLCD with the support-right into the cover. Note the recess for the support-right in the xLCD-cover. The support must fit into the recess. Secure the xLCD-support-right and the xLCD board with two M3x8rT screws. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 37: Step 20 Xlcd-Support-Left Assembly (Xlcd B)
Attach and push the xLCD-knob onto the xLCD encoder pin. Note that there is a flat part on the encoder shaft. There is a geometry on the inside of the knob that should align with the flat part to seat the knob properly. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 38: Step 22 Connecting The Assembly (Xlcd B)
Insert four M3x10 screws through the four holes in the front plate of the printer's frame. Attach the xLCD assembly onto the front plate. The screws should fit into the corresponding openings in the xLCD assembly. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 39: Step 24 Haribo Time
Eat two gummy bears. Follow these instructions! The exact number of gummy bears is crucial to properly completing the upgrade. STEP 25 Well... Let's go to the next chapter: 4. Upgrading the Nextruder. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 40: Upgrading The Nextruder
4. Upgrading the Nextruder Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 41: Step 1 - Mk4S Mmu3
4. Upgrading the Nextruder STEP 1 MK4S MMU3 If you have used MMU3 unit on your MK4/MK3.9 printer, your extruder is slightly different. In that case, please proceed to the dedicated chapter: 4B Upgrading the nextruder MMU3 If you have a single-material printer, continue to the next step. -
Page 42: Step 3 Protecting The Heatbed
Move the Nextruder approximately to the center of the X-axis to gain better access to the entire assembly. Remove the LoveBoard-cover by sliding it up. From the right side of the Nextruder, release and remove the M3x10 screw. Remove the LoveBoard-cover-right from the printer. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 43: Step 5 Removing The Idler-Swivel
Remove the idler-swivel assembly from the Nextruder. Release two M3n nuts and, using the T8 Torx key, remove two M3x20rT screws from the idler-swivel assembly. Tear the assembly into its parts. You will no longer need the plastic parts. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 44: Step 7 Assembling The Idler-Swivel
Place the second idler-swivel from the opposite side of the screw. From the other side, attach the M3nN nut to the screw. Hold the nut using the universal wrench and tighten the screw. Tighten just lightly! The spacer must rotate freely. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 45: Step 8 Assembling The Idler-Nut
Note there are safety latches on each of the connectors which must be pushed in, in order to remove the connector. Disconnect all the small connectors from the left side of the LoveBoard. Disconnect the Nextruder motor (labeled E). Disconnect both cables from the right side of the Nextruder. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 46: Step 10 Removing The Print Fan Assembly
Remove all the disconnected cables from the cable channel. STEP 11 Removing the heatsink fan&hotend Release two M3x18 screws securing the heatsink fan and remove the fan from the Nextruder. Loosen both thumb screws. Pull out the hotend assembly from the Nextruder. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 47: Step 12 Removing The Nextruder
When loosening the Nextruder, hold it with your hand to prevent it from falling. Remove the Nextruder assembly from the X-carriage. Put the printer aside for a moment and let's get on with Nextruder. Remove both thumb screws from the heatsink. Do not discard any parts. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 48: Step 13 Gearbox Versions
4. Upgrading the Nextruder STEP 13 Gearbox versions There were two types of the gearbox on the MK4 printer. The older design with four screws. The newer design with three screws. The upgrade process is the same for both types of the gearbox. -
Page 49: Step 14 Uncovering The Gearbox
Release and remove the M3x6 screw from the Idler-lever-b. Remove the Idler-lever-b (top part) from the idler assembly. Remove both bearings and pins from the Idler-lever-a (base part). Pull out the tubular spacer from the Idler-lever-a. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 50: Step 16 Extruder Idler Assembly: Parts Preparation
Both bearings must be able to rotate without significant resistance. From the same side, push the tubular spacer into the assembly. The "bottom" of the tubular spacer must be flush with the bottom part of the Idler assembly. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 51: Step 18 Pg-Cover: Parts Preparation
The three M3x25 screws are fixing the PG-ring at this moment. Keep them in place for a while. Socket set screw M3x25 (1x) Use either the one you removed earlier or the newly supplied one if you have the older type of gearbox. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 52: Step 19 Installing The Idler And Pg-Cover
STEP 20 Mounting the idler-swivel: parts preparation For the following steps, please prepare: Idler-swivel assembly (1x) you assembled earlier M3x30 screw (2x) you removed earlier Spring 15x5 (2x) you removed earlier Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 53: Step 21 Mounting The Idler-Swivel Assembly
For the following steps, please prepare: MK4S fan holder (1x) Heatsink spacer (1x) M3x12 screw (3x) Do not reuse the M3x10 screws you removed earlier. Due to the new parts, longer M3x12 screws are now required. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 54: Step 23 Assembling The Nextruder
There is a cutout in the plastic part. Guide the thermistor cable through this cutout. DO NOT PINCH ANY OF THE CABLES! Align the heatsink screws with the spacers on the X-carriage and join both parts together by tightening them. Start with the middle one. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 55: Step 25 Connecting The Ntc Thermistor
Guide the NTC thermistor through the cable channel in the X-carriage up to the LoveBoard slot. STEP 26 Assembling the hotend fan: parts preparation For the following steps, please prepare: Hotend fan (1x) you removed earlier M3x18 screw (2x) you removed earlier Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 56: Step 27 Assembling The Hotend Fan
LoveBoard. STEP 28 Print fan blower: parts preparation For the following steps, please prepare: MK4S Print fan blower (1x) Fan-case (1x) Fan-case-cover (1x) Fan-shroud (1x) 3x8sT screw (2x) M3x5rT screw (5x) M3nS nut (5x) Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 57: Step 29 Assembling The Print Fan Case
Guide the print fan blower cable through the cable channel in the Fan-case. Close the fan with Fan-case-cover. Secure the cover with two 3x8sT screws. The screws cut thread directly into the plastic, so there might be some resistance. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 58: Step 31 Assembling The Fan Shroud
Slide the side pockets of the print fan blower assembly onto the two “forks” of the fan holder. Ensure that the holes of both parts are aligned. From the left side of the fan holder, secure both parts together using two M3x5rT screws. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 59: Step 33 Connecting The Print Fan Blower
STEP 34 Prusa Nozzle CHT: parts preparation For the following steps, please prepare: MK4 hotend assembly (1x) you removed earlier New Prusa Nozzle CHT 0.4 (1x) Nextruder Silicone sock (1x) The Nextruder Silicone Sock is optional but recommended for stable temperatures, hotend cleanliness, and protection during high-temperature printing. -
Page 60: Step 35 Removing The Prusa Nozzle
Put the silicone sock back on the heaterblock. This is optional. Keep the removed Prusa Nozzle as a spare part. While it is fully compatible with the MK4S/MK3.9S printer, we recommend using the new Prusa Nozzle CHT, which features improved material flow technology. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 61: Step 37 Inserting The Hotend Assembly: Parts Preparation
While pushing the hotend assembly in, firmly tighten both thumb screws. Avoid pinching any cable between the screws and the heatsink! From the underside, check that the hotend is oriented correctly. It must fit between the cutouts in the X-carriage. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 62: Step 39 Nozzle Insertion Check
Guide the hotend thermistor through the cable channel in the X-carriage and connect it to the LoveBoard. Guide the hotend heater through the cable channel in the X-carriage and connect it to the LoveBoard. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 63: Step 42 Attaching The Fan-Door-Cover
Attach the Fan-door-cover hinge to its counterpart in the X-carriage. Holes in both parts must be aligned. Insert the M3x30 screw in the hinge on the fan-door. Fully tighten the screw, then loosen it by a quarter turn. The fan-door must move freely! Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 64: Step 44 Loveboard: Wiring Check
Close the idler mechanism before proceeding to the next step if you haven't already done so. Use the following sequence: Close the extruder idler to the extruder Close the idler-swivel and lock it over the extruder idler assembly Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 65: Step 45 Covering The Loveboard: Parts Preparation
Make sure the LoveBoard-cover-right fits snugly against the right side of the extruder. If not, it may cause the X-axis test to fail during the self-test because it will prevent the X-carriage assembly from moving all the way to the right. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 66: Step 47 Covering The Loveboard: Top Cover
Print fan assembly (1x) Old PG-case (1x) Old LoveBoard-cover (1x) Old LoveBoard-cover-right (1x) Old Idler-nut (1x) Old Idler-swivel (2x) Old Idler-lever-a (1x) and Idler-lever- b (1x) The list continues in the next step ... Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 67: Step 50 Haribo Time
Over time, the part may experience slight wear, so it's wise to keep it as a spare. Prusa Nozzle (1x) or your other purchased nozzle STEP 50 Haribo time! Now you feel like you can fix anything, right? :) Eat two gummy bears. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 68: Step 51 The Nextruder Is Upgraded
4. Upgrading the Nextruder STEP 51 The Nextruder is upgraded! That was tough, but you made it! We're almost there. Let's continue with chapter 5. Upgrading the connectivity. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 69: Upgrading The Nextruder (Mmu3)
4B. Upgrading the Nextruder (MMU3) Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 70: Step 1 Tools Necessary For This Chapter
It is HIGHLY RECOMMENDED to protect the heatbed. Use any cloth or piece of fabric, which is thick enough and cover the heatbed. This will ensure you won't damage (scratch) the surface during the disassembly. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 71: Step 3 Uncovering The Nextruder
Note there are safety latches on each of the connectors which must be pushed in, in order to remove the connector. Disconnect all the small connectors from the left side of the LoveBoard. Disconnect the Nextruder motor (labeled E). Disconnect both cables from the right side of the Nextruder. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 72: Step 5 Removing The Print Fan Assembly
Remove all the cables from the cable channel. STEP 6 Removing the heatsink fan&hotend Release two M3x20 screws securing the heatsink fan and remove the fan from the Nextruder. Loosen both thumb screws. Pull out the hotend assembly from the Nextruder. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 73: Step 7 Removing The Nextruder
When loosening the Nextruder, hold it with your hand to prevent it from falling. Remove the Nextruder assembly from the X-carriage. Put the printer aside for a moment and let's get on with Nextruder. Remove both thumb screws from the heatsink. Do not discard any parts. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 74: Step 8 Uncovering The Gearbox
When removing the screws, hold the PG-ring (gold-brass part) to prevent it from sliding out. Some versions of the printer have three, some have four screws. Extremely carefully and slowly remove the PG-case from the Nextruder. Prevent any dirt or debris from entering the gearbox. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 75: Step 9 Pg-Case: Parts Preparation
PG-case: parts preparation For the following steps, please prepare: PG-case (1x) new part The older printed PG-case on MK4 required a washer on the inside. The new injection-molded MK4S version does not need the washer. M3x25 screw (3x) you removed earlier... -
Page 76: Step 11 - Assembling The Nextruder: Parts Preparation
Make sure the protrusion protrudes towards you (like the screws). From the extruder motor side of the heatsink, attach the MK4S fan holder to the heatsink. Avoid pinching the NTC thermistor cable. Guide it through the cutout as shown in the detail. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 77: Step 13 Attaching The Nextruder
Locate the cable channel on the left side of the X-carriage. We will guide some of the cables through this channel in the following steps Guide the NTC thermistor through the cable channel in the X-carriage up to the LoveBoard slot. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 78: Step 15 Assembling The Hotend Fan: Parts Preparation
Guide the fan cable through the cutout in the fan holder. Guide the fan cable between the thumb screws under the cable channel up and connect it to the lower slot on the LoveBoard. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 79: Step 17 Print Fan Blower: Parts Preparation
Double-check from the side that the inserted nut is aligned with the hole in the part. From the opposite side, insert two M3nS nuts all the way into the holes. Check that nuts are fully inserted. Insert one M3nS nut into the hole in the Fan-shroud. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 80: Step 19 Assembling The Print Fan Blower
First, insert those teeth into the rectangular cutouts. Close the Fan-shroud and secure it with the M3x5rT screw. Use reasonable force to avoid breaking the parts. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 81: Step 21 Mounting The Print Fan Blower Assembly
From the right side of the fan holder, secure both parts together using two M3x5rT screws. Guide the print fan blower cable through the cable channel in the X-carriage and plug the connector to the middle slot on the LoveBoard. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 82: Step 23 Prusa Nozzle Info
How to replace the Prusa Nozzle (MK4S/MK3.9S). STEP 24 Inserting the hotend assembly: parts preparation For the following steps, please prepare: Hotend assembly (1x) you removed earlier Thumb screw (2x) you removed earlier Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 83: Step 25 Inserting The Hotend Assembly
If not fully inserted, poor heat transfer may occur, potentially leading to issues like nozzle clogs. To adjust the nozzle position, loosen the thumbscrews, reposition the nozzle, and then retighten the screws, while pushing the hotend assembly up. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 84: Step 27 Connecting The Hotend Cables
Guide the hotend heater through the cable channel in the X-carriage and connect it to the LoveBoard. STEP 28 Fan door cover: parts preparation For the following steps, please prepare: Fan-door-cover (1x) M3x30 screw (1x) you removed earlier Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 85: Step 29 Attaching The Fan-Door-Cover
Connect the Loadcell cable coming from the right of the heatsink to the upper slot on the right side of the LoveBoard. Connect the filament sensor cable to the lower slot on the right side of the LoveBoard. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 86: Step 31 Loveboard: Wiring Check
Close the idler-swivel and lock it over the extruder idler assembly STEP 32 Covering the LoveBoard: parts preparation For the following steps, please prepare: LoveBoard-cover (1x) new part LoveBoard-cover-right (1x) new part M3x10 screw (1x) you removed earlier Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 87: Step 33 Covering The Loveboard: Side Cover
Slide the Loveboard-cover on the extruder. And push it all the way down. The cover must go behind the X-carriage-back. Be careful not to pinch any cables. Ensure that the two plastic covers fit together perfectly. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 88: Step 35 The Nextruder Is Upgraded
That was tough, but you made it! STEP 36 Attaching the MMU3 unit Take the MMU3 unit and attach it onto the middle of the frame. Attach the PTFE tube fitting into the Nextruder. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 89: Step 38 Haribo Zeit
Using a zip-tie, attach the cable in the marked position. STEP 38 Haribo Zeit! Now you feel like you can fix anything, right? :) Eat two gummy bears. We're almost there. Let's continue with chapter 5. Upgrading the connectivity. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 90: Upgrading The Connectivity
5. Upgrading the connectivity Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 91: Step 1 Tools Necessary For This Chapter
Opening the electronics Release four M3x6 screws and remove the xBuddybox-cover. Release two M3x10 screws from the El-box-cover and remove the cover from the printer. You will no longer need the El-box-cover (plastic cover). Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 92: Step 3 Removing The Wi-Fi&Heatbed Covers
Even if you no longer need this part for your printer upgrade, keep it for future projects. For example, if you own an Original Prusa MINI/+, you can install this Wi-Fi module to take advantage of the benefits of connectivity on that printer as well. -
Page 93: Step 5 Assembling The Wi-Fi
Close the WiFi cover carefully, ensuring the pins of the ESP module are properly engaged in the connector on the xBuddy. Double-check that the heatbed cable bundle is in place. Secure the cover with three M3x12 screws. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 94: Step 7 Nfc Antenna: Parts Preparation I
This NFCcoil version is pre-assembled, with the antenna cable and adhesive layer attached to the NFCcoil. If you have the pre-assembled version, proceed to the next step; otherwise, go to Connecting the NFC antenna. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 95: Step 9 Installing The Nfccoil (Pre-Assembled)
Gently insert the NFCcoil into the part. And position correctly: The antenna cable and the cable solder joint on the NFC coil board must be oriented as shown. Stick the NFCcoil on the inner side of the El-box-cover approximately like in the picture. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 96: Step 10 Connecting The Nfc Antenna
NFCcoil board. Stick the adhesive film on the cleaned side of the NFCcoil approximately as shown. The side without the company logo. Do not put the adhesive tape over any holes in the board! Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 97: Step 12 Assembling The Nfc Antenna
These differences do not affect the instructions in this manual. Make sure that all connectors are fully inserted and PSU cables properly tightened. Otherwise, there is a risk of damage to the printer! Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 98: Step 14 Covering The Xbuddy Box: Bottom Cover
Carefully cover the xBuddy box by first sliding the bent part of the cover into the box. Avoid pinching the cables. Double-check the NFC coil cable position. Align the xBuddy box cover with the xBuddy box and secure it with four M3x6 screws. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 99: Step 16 Serial Number Label: Parts Preparation
This step is required in order to provide warranty! Don't throw the label away! Remove the MK4 or MK3.9 label from the rear plate on the printer frame. Peel off the protective layer from the rear side of the label. -
Page 100: Step 18 What's Left
Prusa MINI/+, you can install this Wi-Fi module to take advantage of the benefits of connectivity on that printer as well. More information at help.prusa3d.com. Heatbed-cable-holder (1x) STEP 19 Haribo time! That was easy! Eat two! Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 101: Step 20 That's It
But before you start printing, you need to do some selftests and activate some new features. Let's go to the final chapter 6. Preflight check. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 102: Preflight Check
6. Preflight check Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 103: Step 1 Attaching The Print Sheet
MK3.9S support page There, you will always find the latest firmware, handbook, and PrusaSlicer for your printer. Download the latest firmware and save it to a USB drive. The firmware file has a .bbf extension. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 104: Step 3 First Run
(e.g., nozzle with a different diameter, silicone sock removal). Go to Settings -> Hardware and check that the Nextruder Silicone Sock option is set correctly, depending on whether or not you have the Nextruder Silicone Sock installed on the hotend. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 105: Step 5 Wizard - Selftest Start
Thus, you can see all test items marked as completed. However, run the self-test again. After completing the fan test, you will be asked to end the self-test or continue with the remaining tests. Select Continue. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 106: Step 6 Wizard - Loadcell Test
Loosen the three screws on the front of the gearbox by 1.5 turns. The printer will go through the automatic gearbox alignment. This process can’t be seen from the outside. Once prompted, tighten the three screws in the pattern indicated on the screen. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 107: Step 8 Wizard - Filament Sensor Calibration
Once prompted to, insert the filament end into the opening on top of the extruder. Remove the filament after the calibration finishes. STEP 9 Haribo time! Congratulations to all those who patiently ate according to the instructions. Eat the rest! Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 108: Step 10 Loading A Filament
The printer is now ready to print! You can start by printing some of our test objects from the bundled USB drive. The sample objects are also available on the official Prusa Research Printables profile Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 109: Step 12 - Network Setup: Prusa Connect (Optional)
For further details, check out the Prusa Mobile App article. If you need to connect your printer to a network, you have several options available. All available methods are outlined in the Network Connection article. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 110: Step 13 Prusaslicer
Open the PrusaSlicer app. If you’re running it for the first time, Configuration Wizard will show up. Visit the Prusa FFF tab in the Wizard, select Original Prusa MK4S or MK3.9S in the 0.4mm nozzle version (the default nozzle size) and hit Finish to start using the MK4S printer profile. -
Page 111: Step 15 Prusa Knowledge Base
Looking for inspiration on new projects? Check our blog for weekly updates. If you need help with the build, check out our forum with a great community :-) All Prusa services share one user account. Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 112: Manual Changelog
Manual changelog Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade... -
Page 113: Step 1 Version History
Manual changelog STEP 1 Version history Versions of the MK4 to MK4S upgrade manual: 08/2024 - Initial version 1.00 12/2024 - Updated to version 1.01 STEP 2 Changes to the manual (1) 12/2024 - NFC antenna New version of the NFC antenna. - Page 114 Notes:...
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