Prusa Research MMU3 Original Assembly Instructions
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Prusa Research MMU3 Original Assembly Instructions

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Summary of Contents for Prusa Research MMU3

  • Page 1: Table Of Contents

    Table of Contents 1. Introduction ..................................... Step 1 - MMU History and Printer Compatibility ..................Step 2 - Supported printers ......................Step 3 - Disclaimer ....................Step 4 - Tools required ............... Step 5 - View high resolution images ....................
  • Page 2 ............... Step 14 - Idler center shaft assembly ................... Step 15 - Idler body M3nS nut ..............Step 16 - Idler motor assembly (part 1) ..............Step 17 - Idler motor assembly (part 2) ..............Step 18 - Idler motor assembly (part 3) 5.
  • Page 3 ................Step 36 - Rear PTFE installation ................Step 37 - Setting the Idler tension ................ Step 38 - Stickers parts preparation ................. Step 39 - Applying the stickers 7. Cassette Buffer Assembly ................................. Step 1 - Tools necessary for this chapter ..................
  • Page 4 ................Step 13 - Old PTFE tube removal ............... Step 14 - New PTFE tube installation ..............Step 15 - Extruder reassembly (Part 1) ..............Step 16 - Extruder reassembly (Part 2) ..............Step 17 - Extruder reassembly (Part 3) ............
  • Page 5 Step 12 - PrusaSlicer setup for MMU3 ............Step 13 - MMU3 Firmware image download ............Step 14 - MMU3 Firmware flashing (part 1) ............Step 15 - MMU3 Firmware flashing (part 2) ............Step 16 - MK3S+ Firmware image download ............

  • Page 7: Introduction

    1. Introduction Original Prusa MMU3 Assembly...

  • Page 8: Step 1 Mmu History And Printer Compatibility

    1. Introduction STEP 1 MMU History and Printer Compatibility Welcome to the MMU3 assembly guide! There were several generations of the Original Prusa Multi-Material printing solution. Verify you are looking at the correct guide for your MMU unit and your printer.

  • Page 9: Step 2 Supported Printers

    Make sure your printer is fully assembled and works perfectly before you proceed to attach the MMU3 onto it. Make a few single material prints. If it has any issues, fix the issues first. Diagnosing printer issues can be harder with the MMU attached.

  • Page 10: Step 4 Tools Required

    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 icon ("View original") in the top left corner. Original Prusa MMU3 Assembly...

  • Page 11: Step 6 Labels Guide

    Lost in the instructions, missing screw or cracked printed part? Let us know! You can contact us using following channels: Using our 24/7 live chat Or by writing an email to info@prusa3d.com Or, you can use the comments under each step. Original Prusa MMU3 Assembly...

  • Page 12: Step 8 Pro Tip: Inserting The Nuts

    For deep openings, use a long screw such as the M3x30 as a handle. If a hex nut won't fit in: use a screw with a thread along its entire length (typically: M3x10, M3x18) and screw it from the opposite side of the opening to drive the nut Original Prusa MMU3 Assembly...

  • Page 13: Step 9 Printed Parts

    If you prefer to print the plastic parts yourself, use the pre-sliced G-codes and print all the required parts before proceeding with the assembly. The printed parts must be printed perfectly in order for the MMU3 to work correctly: no warping or lifted corners, stringing or other irregularities.

  • Page 14: Step 10 Prepare Your Desk

    OK, we are ready. Let's start! STEP 11 Continue If you’re building a brand new MMU3 Kit from scratch, continue to the chapter: 4. Idler Body Assembly For the MMU2S to MMU3 Upgrade, continue to the chapter: 2. MMU2S Disassembly (UPG)

  • Page 15: Mmu2S Disassembly (Upg)

    2. MMU2S Disassembly (UPG) Original Prusa MMU3 Assembly...

  • Page 16: Step 1 Introduction

    Maintain a well-organized workspace to avoid mixing older parts with the new ones. Although some new components might resemble the old ones, they are actually distinct. Note that certain components shouldn't be reused for MMU3, while others are necessary for the upgrade.

  • Page 17: Step 3 Disconnecting The Ptfe Tubes

    Remove all five PTFE tubes and dispose of them immediately. These tubes will not be used again for MMU3. MMU3 is designed to work with differently-sized PTFE tubes. Reusing MMU2S tubes during the assembly of MMU3 will result in incorrect operation.

  • Page 18: Step 5 Disconnecting The Mmu2S (Part 2)

    MMU from the printer. You can set the printer aside for now. We can move onto disassembling the MMU2S unit itself. For the following step, please prepare the MMU-to-Extruder PTFE tube with the Festo fittings QSM-M5 attached. Original Prusa MMU3 Assembly...

  • Page 19: Step 7 Mmu-To-Extruder Ptfe Tube Disassembly

    Save the Festo fittings for later use. Discard the PTFE tube so you don't confuse it with a new one later on! MMU3 is designed to work with differently-sized PTFE tubes. Reusing MMU2S tubes during the assembly of MMU3 will result in incorrect operation.

  • Page 20: Step 8 Mmu2S Unit Disassembly

    Separate the power and data cable bundle from the rest of the cables. Remove the textile wrap off the cables and save the textile wrap for later use. The MMU2S power and data cables won’t be used in MMU3. Original Prusa MMU3 Assembly...

  • Page 21: Step 10 Idler Motor Removal

    Using the shorter side of the 2.5mm Allen key, push the 5x16sh shaft from the inside out. Repeat the same process on the other side. Remove the M3x10 screw and push the 5x16sh shaft outward. Save the 5x16sh shafts for later use. Original Prusa MMU3 Assembly...

  • Page 22: Step 12 Bearings Removal

    Using the 2.5mm Allen key, remove the five M3x10 screws holding the motors. Rotate the motor shaft some more to disengage it from the selector. Pull out the selector motor to remove it from the unit. Save the motor for later use. Original Prusa MMU3 Assembly...

  • Page 23: Step 14 Selector Removal

    On the bottom side, remove the remaining M3x10 screws holding the pulley motor. Remove the pulley motor from the unit. Save the motor for later use. Using the Allen key, tilt the pulley bearing in order to remove it. Save it for later use too. Original Prusa MMU3 Assembly...

  • Page 24: Step 16 Selector Disassembly

    Handle the board by its sides to avoid damage. Be careful around the electronics, do not touch the individual components on the board. Remember that the board is sensitive to electrostatic discharge (ESD). Original Prusa MMU3 Assembly...

  • Page 25: Step 18 Summary

    Stepper motor (3x) Idler, Selector and Pulley motor (with pulleys still attached) Electronics: the control board (1x) and FINDA/SuperFINDA sensor (1x) 625 bearing (3x) Trapezoid nut (1x) Festo fittings QSM-M5 (2x) 5x16sh shaft (2x) 5x120sh shaft (2x) Original Prusa MMU3 Assembly...

  • Page 26: Mmu2S Buffer Disassembly (Upg)

    3. MMU2S Buffer Disassembly (UPG) Original Prusa MMU3 Assembly...

  • Page 27: Step 1 Preparation

    PTFE tubes in the buffer. Pull all the PTFE tubes out. Dispose of the tubes to prevent them from getting mixed up with the new ones in the future. These tubes will not be used again. Original Prusa MMU3 Assembly...

  • Page 28: Step 3 Buffer Disassembly

    Set the printed parts aside so that they don't mix up with the new parts. These parts won’t be re-used. STEP 4 Summary That was simple, wasn't it? From the disassembled buffer, please save the buffer plates for later use. Original Prusa MMU3 Assembly...

  • Page 29: Idler Body Assembly

    4. Idler Body Assembly Original Prusa MMU3 Assembly...

  • Page 30: Step 1 Tools Necessary For This Chapter

    2.5mm Allen key for M3 screws STEP 2 Idler versions There were two versions of the Idler: 1. The MMU3 Idler to be used with the metal Coupler This is the correct part bundled in the MMU3 Kit. 2. The old MMU2S Idler with a printed coupling part.

  • Page 31: Step 3 Idler Parts Preparation

    Install the second bearing and the shaft in the same way as the first one. Make sure you are inserting the parts into the exact same openings as seen in the picture. Install the third bearing and the shaft into the corresponding opening using the same technique. Original Prusa MMU3 Assembly...

  • Page 32: Step 5 Idler Bearings Assembly (Part 2)

    Shafts can be pushed out using a 2mm Allen key in the opposite order from the installation. STEP 6 Idler center bearing assembly Take the remaining bearing and push it into the opening on the side of the idler. Make sure the bearing is flush (aligned) with the surface. Original Prusa MMU3 Assembly...

  • Page 33: Step 7 Coupler Parts Preparation

    Just start the thread so that the grub screw holds in. Make sure none of the two grub screws is protruding into the opening in the center. Otherwise, the coupler will be hard to slide onto the motor shaft later on. Original Prusa MMU3 Assembly...

  • Page 34: Step 9 Coupler Assembly

    The grub screw orientation is important so that the grub screws remain accessible even after the Idler is installed inside the MMU unit. All five bearings are able to rotate. The sixth bearing is flush with the surface. Original Prusa MMU3 Assembly...

  • Page 35: Step 11 - Idler Body Parts Preparation

    If it doesn't engage, try cleaning up the opening with an Allen key and rotating the stopper while inserting. Verify it is seated properly and won't fall out. The top part should be flush and there should be bottom part of the stopper visible from the side. Original Prusa MMU3 Assembly...

  • Page 36: Step 13 Idler Installation

    The shaft must engage into the bearing in the Idler. Press the shaft all the way in using the 2.5mm Allen key. Lock the shaft in place by attaching an M3x10 screw into the marked position. Tighten it up. Original Prusa MMU3 Assembly...

  • Page 37: Step 15 Idler Body M3Ns Nut

    Orient the coupler so that one of the grub screws is pointing up. Insert the motor shaft into the metal coupler on the Idler. Push the motor towards the Idler body until flush. Original Prusa MMU3 Assembly...

  • Page 38: Step 17 Idler Motor Assembly (Part 2)

    Make sure the grub screw in the metal Coupler is still aligned to the flat part of the motor shaft. Tighten it up fully using the 2mm Allen key. Rotate the idler so that the second grub screw on the metal coupler is accessible. Tighten the other grub screw fully too. Original Prusa MMU3 Assembly...

  • Page 39: Selector Assembly

    5. Selector Assembly Original Prusa MMU3 Assembly...

  • Page 40: Step 1 Tools Necessary For This Chapter

    2.5mm Allen key for M3 screws STEP 2 Selector assembly: Parts preparation For the following steps, please prepare: Selector (1x) 10x6x2 Magnet (1x) Magnetic steel ball (1x) Make sure you are using the newly supplied ball, not the old one. Original Prusa MMU3 Assembly...

  • Page 41: Step 3 Selector Assembly: Magnetic Ball

    There is an opening on the side of the selector through which you can observe the ball's position. The selector ball from the older MMU2S can't be re-used as it is non-magnetic. Use only the supplied MMU3 magnetic version. STEP 4 Selector assembly: Trapeze nut parts preparation...

  • Page 42: Step 5 Selector Assembly: Trapeze Nut Installation

    We will tighten them up fully later on. STEP 6 Selector assembly: Rods and Cover parts preparation For the following steps, please prepare: M3nS nuts (2x) Bushing tube 5x6x25bt (2x) M3x10 screws (2x) Selector front plate (1x) Original Prusa MMU3 Assembly...

  • Page 43: Step 7 Selector Assembly: Bronze Bushing Tubes

    Push the nuts all the way in using the 1.5mm Allen key. Add the front plate onto the selector. Make sure the side of it is flush with the flat part of the selector. Attach the front plate with two M3x10 screws. Tighten them up. Original Prusa MMU3 Assembly...

  • Page 44: Step 9 Selector Assembly: Finda Parts Preparation

    Fix the probe in place with M3x10 screw. Tighten the screw up just so that the sensor can no loner be moved. Avoid over-tightening the screw; if SuperFINDA is securely held in place, that's sufficient. Original Prusa MMU3 Assembly...

  • Page 45: Step 11 - Selector Assembly: Cutter Parts Preparation

    Cover the blades with the blade holder. Verify the blades are still seated perfectly in place while attaching the cover. Fix the blade holder in place with M3x10 screw. Tighten it up fully. Original Prusa MMU3 Assembly...

  • Page 46: Pulley Body Assembly

    6. Pulley Body Assembly Original Prusa MMU3 Assembly...

  • Page 47: Step 1 Tools Necessary For This Chapter

    1.5mm Allen key for nut alignment 2.5mm Allen key for M3 screws A measurement tool (optional), a digital caliper would work the best. STEP 2 Pulley-body parts preparation For the following steps, please prepare: Pulley body (1x) 625Z bearing (3x) Original Prusa MMU3 Assembly...

  • Page 48: Step 3 Pulley Body: Inserting Bearings

    Front PTFE-holder (1x) M3nS nut (4x) M3x10 screw (4x) PTFE tube 19mm (5x) MMU2S and MMU3 PTFE tubes differ. If you are upgrading your MMU, Make sure you are not re-using the MMU2S PTFE tubes. Original Prusa MMU3 Assembly...

  • Page 49: Step 5 Front-Ptfe-Holder Assembly

    Pulley body. Mind the correct orientation seen in the picture. Secure the holder with four M3x10 screws from the front. STEP 6 Collet holder parts preparation For the following steps, please prepare: Collet holder (1x) M3n nut (2x) M3x10 screw (2x) Collet (5x) Original Prusa MMU3 Assembly...

  • Page 50: Step 7 Collets Installation

    Attach the collet holder into the pulley body. Note the correct part orientation marked by the arrow. The arrow on the collet holder should be pointing towards the pulley body. Secure the collet holder in place by two M3x10 screws. Original Prusa MMU3 Assembly...

  • Page 51: Step 9 Pulley Motor Parts Preparation

    Ensure the grooved part of the pulley is on the motor side. Slide the other pulleys onto the shaft using the same technique. Tighten the grub screws just slightly for now. Original Prusa MMU3 Assembly...

  • Page 52: Step 11 Pulley Motor Assembly (Part 1)

    If it is hard to turn, release the screw fully, re-align it, and start tightening it from the beginning to avoid cross-threading it. Now, turn the unit around again to tighten up the top screw fully too. Original Prusa MMU3 Assembly...

  • Page 53: Step 13 Pulley Alignment

    Check the proper positioning of all of the pullies again. Adjust it if necessary. STEP 14 Selector: parts preparation For the following steps, please prepare: Selector assembly (1x) you prepared earlier. Selector motor (1x) 5x120sh Shaft (2x) M3nS nut (2x) M3x10 screw (3x) Original Prusa MMU3 Assembly...

  • Page 54: Step 15 Selector Installation

    Verify the selector can move around freely while the rods are in place. Insert the selector motor so that its trapezoidal shaft goes through the pulley body as seen in the picture. Make sure the selector motor cable is pointing up before you proceed to attach the motor. Original Prusa MMU3 Assembly...

  • Page 55: Step 17 Selector Motor Installation

    Note that you have to excert some force to move it as the motor has physical resistance. Move the selector all the way to the left. Fully tighten the two screws that secure the trapezoid nut. Original Prusa MMU3 Assembly...

  • Page 56: Step 19 Idler Body Installation Parts Preparation

    Insert the 5x16 shaft into the marked opening and push it all the way in until it engages into the bearing in the pulley body. Insert the other 5x16 shaft into the marked opening on the other side. Push it all the way in. Original Prusa MMU3 Assembly...

  • Page 57: Step 21 Idler Body Installation (Part 2)

    Tighten them until the screws are just above the surface. Do not tighten the screws too much. The top of the screw heads shouldn't be below the surface. Later on, we will use these screws to set the Idler tension. Original Prusa MMU3 Assembly...

  • Page 58: Step 23 Control Board Parts Preparation

    Slide in the Control board into the cover. Note the three butons in the front have to go in first. Fix the board in place with three M3x6 screws. Be careful not to damage any of the small components on the board. Original Prusa MMU3 Assembly...

  • Page 59: Step 26 Pd-Board Installation

    Don't connect or disconnect the cable if the printer is connected to the power outlet or is powered on. Connect the MMU/printer cable into the PD-board. Original Prusa MMU3 Assembly...

  • Page 60: Step 27 Textile Sleeve Parts Preparation

    Rule of thumb for the motor cables is; if you look from the back of the unit, the motor connectors are on the same sides as the motors, while the motor at the front (selector) occupies the middle connector. Original Prusa MMU3 Assembly...

  • Page 61: Step 29 Electronics Assembly

    Join the Selector motor cable with the SuperFINDA cable using a zip-tie in the marked position, as seen in the picture. Join the cables together with the Pulley motor cable in the marked position using a zip-tie. Original Prusa MMU3 Assembly...

  • Page 62: Step 31 Cable Management (Part 2)

    Fix these cables to the right attaching point on the ele-cover using a zip-tie. Verify your cable management looks the same as seen in the picture. STEP 32 Frame holders parts preparation Frame holder (2x) Label-plate (1x) M3x10 screws (6x) M3nS nut (2x) Original Prusa MMU3 Assembly...

  • Page 63: Step 33 Frame Holders Assembly

    If the bolt doesn't go in easily, use the 1.5mm Allen key to adjust the nut position inside the Pulley body. STEP 34 Label plate installation Insert the label plate into the recess on the front of the frame holders. Fix the label plate in place using the two M3x10 screws. Original Prusa MMU3 Assembly...

  • Page 64: Step 35 Rear Ptfe Parts Preparation

    Don't worry, the screws won't fall out. There are small windows next to each of the pulley positions. Verify the PTFE tube is fully inserted and its end is visible inside the window. If not, push the tube in some more. Original Prusa MMU3 Assembly...

  • Page 65: Step 38 Stickers Parts Preparation

    With too high idler tension, the idler will struggle with determining its home position and the MMU unit won't work properly. STEP 38 Stickers parts preparation For the following steps, please prepare: Serial number sticker (1x) Safety sticker (1x) Original Prusa MMU3 Assembly...

  • Page 66: Step 39 Applying The Stickers

    Applying the stickers Remove the safety sticker from the protective layer. Apply the safety sticker onto the right side of the MMU3 unit. The correct position is depicted in the second picture. Apply the serial number sticker on the bottom of the MMU3 unit using the same method as before.

  • Page 67: Cassette Buffer Assembly

    7. Cassette Buffer Assembly Original Prusa MMU3 Assembly...

  • Page 68: Step 1 Tools Necessary For This Chapter

    1.5mm Allen key for possible nut alignment 2.5mm Allen key for M3 screws STEP 2 Parts preparation For the following steps, please prepare: Buffer plate (6x) Printer holder (1x) Buffer-leg (1x) Segmenter (1x) M3x30 screws (6x) M3nS nuts (6x) Original Prusa MMU3 Assembly...

  • Page 69: Step 3 Peeling The Plates

    Insert four M3nS nuts into the small marked openings in the Segmenter. Push them all the way in. Insert the remaining two M3nS nuts into the marked openings on the Printer holder. Push them all the way in. Original Prusa MMU3 Assembly...

  • Page 70: Step 5 Assembly (Part 2)

    Leg should be on the ground. STEP 6 Assembly (part 3) Insert the remaining 5 buffer plates into the corresponding openings on the Segmenter and Printer holder. The whole assembly now should look like the one in the second picture. Original Prusa MMU3 Assembly...

  • Page 71: Step 7 Assembly (Part 4)

    Note that some versions of the part may have the opening on the opposite side, but the assembly process remains the same. Do not overtighten the screw. Otherwise, the buffer plates might deform. Push the screw into the assembly until it reaches the nut. Tighten it up. Original Prusa MMU3 Assembly...

  • Page 72: Step 9 Parts Preparation: Plate-Holders

    7. Cassette Buffer Assembly STEP 9 Parts preparation: Plate-holders For the following steps, please prepare: Plate-holder (5x) STEP 10 Assembly (part 6) Attach the plate holders to the plates in the marked positions. Original Prusa MMU3 Assembly...

  • Page 73: Step 11 - Buffer Segment Parts Preparation

    STEP 12 Segment assembly (part 1) Insert the bearing into the center opening in the wheel. Make sure the bearing is inserted all the way in, until flush with the surface. Repeat for the remaining four wheels. Original Prusa MMU3 Assembly...

  • Page 74: Step 13 Segment Assembly (Part 2)

    Cover the assembly with another Segment part. Push both parts together to make sure the center shaft engaged into the top segment too. Join both parts together using four M3x6 screws. Turn the assembly around. Add the fifth M3x6 screw from the other side. Original Prusa MMU3 Assembly...

  • Page 75: Step 15 Collets: Parts Preparation

    Otherwise, one of the fins might spread outwards, resulting in a damaged collet. Insert another collet into the other opening. Install collets into the remaining four cartridges too. Original Prusa MMU3 Assembly...

  • Page 76: Step 17 Cartridge Installation

    You can hold the cartridge by the two handles. Squish the handles together for easier insertion. For a later cartridge removal, squish the two handles together and pull it out. STEP 18 PTFE tubes parts preparation For the following steps, please prepare: PTFE 650mm (5x) PTFE-clip (1x) Original Prusa MMU3 Assembly...

  • Page 77: Step 19 Ptfe Tubes Installation

    STEP 19 PTFE tubes installation Insert the PTFE tubes into the upper collet in each of the cartridges. Push them all the way in. Join the PTFE tubes together using the PTFE clip approximately in the middle. Original Prusa MMU3 Assembly...

  • Page 78: Spool Holder Assembly

    8. Spool holder Assembly Original Prusa MMU3 Assembly...

  • Page 79: Step 1 Two Spoolholder Types

    This version comes in five packages inside a smaller box. If you have this version, skip to Injection molded spoolholder: parts preparation STEP 2 Vacuum formed holder parts preparation For the following steps, please prepare: Spoolholder base (1x) Foam pad (4x) Original Prusa MMU3 Assembly...

  • Page 80: Step 3 Foam Pads Installation

    Peel off the yellow protective layer off the foam pads. Attach the four foam pads into the bottom corners of the spoolholder base. STEP 4 Rods, Bearings parts preparation For the following steps, please prepare: PTFE holder (1x) Shaft (2x) Plug (4x) Bearing (4x) Original Prusa MMU3 Assembly...

  • Page 81: Step 5 Rods And Bearings Assembly

    There is a notch on the front part of the spoolholder. Attach the PTFE holder onto the notched front part of the spoolholder. Repeat the same steps to build the remaining spool holders until you finish all five. Original Prusa MMU3 Assembly...

  • Page 82: Step 7 Injection Molded Spoolholder: Parts Preparation

    Foam Pads (1x) PTFE holder (1x) STEP 9 Base assembly (part 1) Take one Base part. Arrange it as seen in the picture. Insert two wheels into the Base. Cover the assembly with another Base part on top. Original Prusa MMU3 Assembly...

  • Page 83: Step 10 Base Assembly (Part 2)

    There is a bending line inside the inner opening on the bottom of the spoolholder side part. Attach an individual foam pad strip onto the middle of the bending line inside the opening, as seen in the picture. Original Prusa MMU3 Assembly...

  • Page 84: Step 13 Ptfe Holder Assembly

    Take the spoolholder Guide part. Hook the end of the PTFE holder onto the Guide Make sure the longer part of the PTFE holder is located at the narrower side of the Guide part. Push the PTFE holder down onto the Guide until it fully engages and locks in place. Original Prusa MMU3 Assembly...

  • Page 85: Step 14 Finishing Up The Spoolholders (Inj. Mol.)

    Or, if you flip one of the Guides around, they can be joined in an arc pattern. This is handy to form an arc of spool holders around the Buffer so that each filament path is as straight as possible. Original Prusa MMU3 Assembly...
  • Page 86 8. Spool holder Assembly STEP 16 Continue If you’re building MMU3 Kit from scratch, continue to the following chapter: MK3S+ Extruder mod (KIT) These chapters will get you through the required extruder modification. If you’re doing the MMU2S to MMU3 Upgrade, continue to the...

  • Page 87: Mk3S+ Extruder Mod (Kit)

    9B. MK3S+ Extruder mod (KIT) Original Prusa MMU3 Assembly...

  • Page 88: Step 1 Tools Necessary For This Chapter

    The filament is unloaded and the print head is at a height it is easily accessible at. The printer is properly cooled down and the steel sheet has been removed. The printer is turned off and unplugged. Original Prusa MMU3 Assembly...

  • Page 89: Step 3 Releasing The Cable Bundle

    STEP 3 Releasing the cable bundle In order to use MMU3 on your MK3S+, a few components on the print head need to be changed. First, we need to release the extruder cable bundle. Using an Allen key release the M3x40 screw on the electronics box and open the door on the other side.

  • Page 90: Step 5 X-Carriage-Back Disassembly

    Release both M3x40 screws on the front, just few turns to create about 0.5cm (0.2inch) gap in the extruder body. Release and remove all screws holding the Hotend fan on the side. Remove the fan. We need to reach a screw behind the fan. Original Prusa MMU3 Assembly...

  • Page 91: Step 7 Extruder-Body Disassembly

    This way, the cable should slide without a significant resistance. Combine gentle pushing and pulling on the cable to avoid damage. We aim to get 6cm (2.4in) of the cable above the top of the extruder body. Original Prusa MMU3 Assembly...

  • Page 92: Step 9 Hotend Ptfe Tube Info

    We will use them to hold the extruder parts together. Carefully split the extruder apart by pulling the front out. Create approx. a 1cm (0.5in) gap similar to the one seen in the picture. Original Prusa MMU3 Assembly...

  • Page 93: Step 11 - Partial Extruder Disassembly

    PTFE for MK3S+ is 42.3mm long, 1.85mm ID, 4mm OD, inner chamfer on one side, outer chamfer on the other. The bundled PTFE tube is intended for MK3S+ only. The PTFE tubes for MK3S and MK3S+ differ in length. Original Prusa MMU3 Assembly...

  • Page 94: Step 13 Old Ptfe Tube Removal

    Using your other hand pull the collet out while you keep pushing the PTFE tube in. THIS IS CRUCIAL for the hotend to work properly. After you finish inserting the new PTFE tube, check that the whole hotend is tightened up and nothing got loose during the process. Original Prusa MMU3 Assembly...

  • Page 95: Step 15 Extruder Reassembly (Part 1)

    Guide the thermistor cables above the thick heater cables. Take a look from the side of the extruder. The nozzle should be slightly below the printed fan-shroud. If it is significantly lower than in the picture, your hotend isn’t inserted correctly. Original Prusa MMU3 Assembly...

  • Page 96: Step 17 Extruder Reassembly (Part 3)

    For the following steps, please prepare: Adapter-printer-mmu (1x) The package should include only the orange adapter. If you have printed parts yourself, please don't use the version with the hole for steel ball. (used for single-material printers) Original Prusa MMU3 Assembly...

  • Page 97: Step 19 Adapter-Printer Assembly

    STEP 20 New chimney: parts preparation For the following steps, please prepare: Chimney base (1x) with the Tappex Microbarb 0006-M5 threaded insert Chimney (1x) M3nS nut (1x) M3 washer (1x) M3x30 screw (1x) M3x18 screw (1x) Original Prusa MMU3 Assembly...

  • Page 98: Step 21 New Chimney Assembly (Part 1)

    Fix the parts together by M3x18 screw. Tighten it up just so that the parts hold on the extruder. Don't tighten it up fully yet. We will need to move the parts later on. Original Prusa MMU3 Assembly...

  • Page 99: Step 23 New Chimney Assembly (Part 3)

    STEP 24 IR Filament sensor: parts preparation For the following steps, please prepare: IR-sensor cover (1x) M2x8 screw (1x) you removed from the printer earlier Prusa IR filament sensor (1x) you removed from the printer earlier Original Prusa MMU3 Assembly...

  • Page 100: Step 25 Ir Filament Sensor Assembly

    The printed part will be replaced with a new one. Using a 2.5mm Allen key, push the shaft out. Keep it for later use. Take the Bondtech gear out, BUT BE CAREFUL, there are two bearings inside. Don't lose them!!! Original Prusa MMU3 Assembly...

  • Page 101: Step 27 Extruder-Idler-Mmu Parts Preparation

    Add a tiny bit of lubricant into the geared part of the Bondtech gear. Make sure the lubricant doesn’t get into the filament groove. Do not use excessive amount of lubricant. Just a tiny bit will do. Original Prusa MMU3 Assembly...

  • Page 102: Step 29 Extruder-Idler-Mmu Assembly (Part 1)

    STEP 30 Extruder-idler-mmu assembly (Part 2) Using the 2.5mm Allen key, push the shaft in so that it is inserted evenly on both sides. Ensure the Bondtech gear is able to rotate freely. Original Prusa MMU3 Assembly...

  • Page 103: Step 31 Extruder Fasteners Parts Preparation

    The fan has two sides, one has a sticker with markings on it. Make sure, this side is facing to the inside of the extruder. Fix the fan using the following screws (depending on the fan version): M3x14 / M3x16b screw (3x) M3x20 / M3x22b screw (1x) in the bottom corner. Original Prusa MMU3 Assembly...

  • Page 104: Step 33 Extruder-Idler-Mmu Installation

    V-shape, the axis won’t be able to move correctly and the top X- axis rod will get damaged. Tighten the top screws just lightly. Remember, the top two bearings are secured by the zip-ties - so the top two screws do not have to be overly tight. Original Prusa MMU3 Assembly...

  • Page 105: Step 35 Zip-Ties

    Hold it tight while you fix it in place with the zip ties. IMPORTANT: Cut the remaining part of each zip tie using pliers as closest to its head as possible. Note the correct position of each zip ties's head (pointing up) Original Prusa MMU3 Assembly...

  • Page 106: Step 37 Attaching The Hotend Cables

    Extruder-cable-clip. Make sure no cable is getting pinched! For easier cable-management inside the electronics box, attach the extruder cable bundle to the hooks on the inside of the Einsy-base with two zip-ties in the marked positions. Original Prusa MMU3 Assembly...

  • Page 107: Mk3S+ Extruder (Upg)

    9C. MK3S+ Extruder (UPG) Original Prusa MMU3 Assembly...

  • Page 108: Step 1 Tools Necessary For This Chapter

    Your MMU unit is now ready. In the following steps, we will work on the extruder. Namely, the filament sensor inside the "chimney". First, make sure the extruder PTFE tube with the fittings is removed from the printer. Original Prusa MMU3 Assembly...

  • Page 109: Step 3 Old Chimney Disassembly (Part 1)

    Remove the cover. Set it aside so that it won't mix up with the new parts. Disconnect the plug from the IR Filament sensor. Remove the IR Filament sensor and set it aside for later use. Original Prusa MMU3 Assembly...

  • Page 110: Step 5 Old Chimney Disassembly (Part 3)

    Note the connector orientation on the picture. This way, the connector will pull out of the part easily without a risk of damaging it. Remove the ir-sensor-holder and set it aside so it won't mix up with the new parts. Original Prusa MMU3 Assembly...

  • Page 111: Step 6 Hotend Ptfe Tube Info

    Release and remove all screws holding the Hotend fan on the side. Remove the fan. We need to split the extruder in order to replace the hotend PTFE tube. Look at the back of the extruder. Remove the M3x40 screw in the top right corner. Original Prusa MMU3 Assembly...

  • Page 112: Step 8 Splitting The Extruder

    If the hotend is still stuck inside, release the screws below the motor some more to increase the gap between the printed parts. BE EXTRA CAUTIOUS with the hotend cables!!! You can break them! Use a reasonable force to pull the hotend out. Don't bend the cables too much. Original Prusa MMU3 Assembly...

  • Page 113: Step 10 Ptfe Tube Parts Preparation

    If you force the PTFE tube out without the hooks properly disengaged, the PTFE tube can jam inside. Throw the worn-out PTFE tube immediately to the nearest trash bin to avoid installing it back by accident ;) Original Prusa MMU3 Assembly...

  • Page 114: Step 12 New Ptfe Tube Installation

    IT IS CRUCIAL to ensure the hotend is fitted properly in the extruder-body!!! The top of the hotend must fit into the correct recesses in the printed parts. See the second and the third picture for a reference! Original Prusa MMU3 Assembly...

  • Page 115: Step 14 Extruder Reassembly (Part 2)

    In case of any significant resistance STOP immediately and check, which part is blocking the movement. Tighten the two M3x40 screws on the front of the extruder. Now, look at the back of the extruder. Re-insert and tighten up the M3x40 screw on the right. Original Prusa MMU3 Assembly...

  • Page 116: Step 16 Extruder Fan Reassembly

    STEP 17 New chimney: parts preparation For the following steps, please prepare: Chimney base (1x) with the Tappex Microbarb 0006-M5 threaded insert Chimney (1x) M3nS nut (1x) M3 washer (1x) M3x30 screw (1x) M3x18 screw (1x) Original Prusa MMU3 Assembly...

  • Page 117: Step 18 New Chimney Assembly (Part1)

    Fix the parts together by M3x18 screw. Tighten it up just so that the parts hold on the extruder. Don't tighten it up fully yet. We will need to move the parts later on. Original Prusa MMU3 Assembly...

  • Page 118: Step 20 New Chimney Assembly (Part 3)

    IR Filament sensor: parts preparation For the following steps, please prepare: IR-sensor cover (1x) The new one M2x8 screw (1x) you removed from the printer earlier Prusa IR filament sensor (1x) you removed from the printer earlier Original Prusa MMU3 Assembly...

  • Page 119: Step 22 Ir Filament Sensor Assembly

    Look at the back of the extruder. Connect the cable to the filament sensor. Make sure the safety latch on the connector is pointing up and the connector aligns with the pins. If you plug the connector incorrectly, you can damage the eletronics!!! Original Prusa MMU3 Assembly...

  • Page 120: Step 23 Extruder-Idler-Mmu2S Parts Preparation

    If the shape differs, you might need to transfer the Bondtech gear and the nut into the new plastic part. MK3S MMU2S Idler is different than MK3S+ MMU2S / MMU3 Idler and cannot be re-used.

  • Page 121: Step 25 Extruder-Idler-Mmu2S Installation

    STEP 26 Opening the electronics box Undo the M3x40 screw on the Einsy box to open up the electronics box on the printer. Open up the Einsy-door on the inner side of the electronics box. Original Prusa MMU3 Assembly...

  • Page 122: 10B. Mk3S+ Setup And Calibration

    10B. MK3S+ Setup and Calibration Original Prusa MMU3 Assembly...

  • Page 123: Step 1 Tools Necessary For This Chapter

    STEP 2 Attaching the MMU unit (part 1) The MMU3 unit should be placed in the middle of the top part of the printer's aluminum frame. Place the MMU3 unit onto the frame. Attach it just by the top hooks.

  • Page 124: Step 3 Attaching The Mmu Unit (Part 2)

    Guide the cable bundle from the MMU unit into the box. The cable should be placed just next to the printer's frame. You can fix the cable to the MMU3 holder using a zip-tie in marked location. Make sure it points to the side - not down. Otherwise, it might interfere with the extruder cable while printing.

  • Page 125: Step 5 Trimming The Electronics Box Door

    Attach the top hinge to the printers frame using the M3x10 screw. Make sure there is enough clearance for the MMU3 cable when you close the door. The cable should be held by the door but must not be squished too much.

  • Page 126: Step 7 Electronics Wiring Diagram Mk3S

    Follow the diagram shown here in case you need to reconnect any of the extruder cables into the Einsy Rambo control board. Since, MK2.5S printer isn’t officially supported in combination with the MMU3, this guide doesn’t cover connecting the electronics on it. Instead, it is described in the MK2.5S MMU2S guide.

  • Page 127: Step 9 Connecting The Power Cables

    STEP 10 Closing the electronics box Close the door. Make sure no wire is being pinched while you close the door. Tighten up the M3x40 screw from the other side to lock the door. Original Prusa MMU3 Assembly...

  • Page 128: Step 11 - Software Download

    STEP 11 Software Download Visit help.prusa3d.com/downloads Find the ORIGINAL PRUSA MMU3 on the list. In the Drivers & Apps section, download the latest package. Leave this page open for the next step! Install the package on your computer and open PrusaSlicer.

  • Page 129: Step 12 - Prusaslicer Setup For Mmu3

    The default nozzle is 0.4mm from factory. Click Finish to close the Wizard. In Printer: menu, select the MK3S & MK3S+ MMU3 profile for future slicing. Note, the MMU3 is reverse-compatible with the older MMU2S Slicer profile and G- codes - but not with the MMU2 profiles!

  • Page 130: Step 14 Mmu3 Firmware Flashing (Part 1)

    MMU3 Firmware flashing (part 2) Open PrusaSlicer and select Configuration ->Flash Printer Firmware from the top menu. Hit Browse and select the MMU3 firmware image file on your computer. (e.g. MMU3_3.0.0.hex) Serial port should be auto-detected. Hit the Flash button.

  • Page 131: Step 16 Mk3S+ Firmware Image Download

    You will need to update both the firmwares for the printer as well as the MMU unit. Use only a combination of the newest firmware versions for both devices together. MMU3 requires a MK3S+ printer firmware 3.13 or newer! If you are updating from a printer firmware 3.11 or older, the printer will require...

  • Page 132: Step 18 Mk3S+ Firmware Flashing (Part 2)

    Hit Rescan to make sure your printer appears in the Serial port: column Hit the Flash button. Wait until you see the Flashing succeeded message. In case of any issues with flashing the firmware please visit our troubleshooting article. Original Prusa MMU3 Assembly...

  • Page 133: Step 19 Turning The Mmu On And Reset

    In case of necessity, the reset button is also useful to help you get out of some unrecoverable situations even for the MMU unit. But remember, it also aborts an ongoing print immediately. Original Prusa MMU3 Assembly...

  • Page 134: Step 20 Ir Filament Sensor Calibration (Part 1)

    Tighten the calibration screw until the chimney moves all the way to the left. Insert a 1.5mm Allen key into the extruder. Don't push it all the way in yet. Make sure you are using the thinnest of the bundled Allen keys; 1.5mm. Do not use the 2mm one!! Original Prusa MMU3 Assembly...

  • Page 135: Step 21 Ir Filament Sensor Calibration (Part 2)

    Then, release it another half turn. By rotating the calibration screw, we need to fine-tune the chimney position so that the number on the LCD reliably changes when inserting and removing the Allen key or filament from the Bontech gears. Original Prusa MMU3 Assembly...

  • Page 136: Step 22 Ir Filament Sensor Calibration (Part 3)

    10B. MK3S+ Setup and Calibration STEP 22 IR filament sensor calibration (Part 3) Calibrating the IR filament sensor is super-crucial in order for MMU3 unit to work properly! Please, repeat this check several times. Confirm the sensor works correctly: See the LCD again if the Fil. sensor number displays 1 when Allen key (/filament) is inserted all the way or 0 when it´s not inserted all the way in.

  • Page 137: Step 23 Superfinda Sensor Calibration Info

    If there is a filament in the selector, the steel ball is risen and should be detected by the SuperFINDA sensor. The distance between the ball and the sensor is what must be perfectly calibrated. Original Prusa MMU3 Assembly...

  • Page 138: Step 24 Superfinda Calibration

    Keep repeating the test by inserting and removing the filament. Watch the values on the LCD. Adjust the SuperFINDA height accordingly until you get reliable readings from the sensor each time you insert and remove the filament. Original Prusa MMU3 Assembly...

  • Page 139: Step 25 Error Code Details (Part 1)

    F1 is the expected filament position. It means, the selector is in the first position. 1>3 would mean, the selector is changing from the first to the third. F? = position not yet set. 205° is the current nozzle temperature. Original Prusa MMU3 Assembly...

  • Page 140: Step 26 Error Code Details (Part 2)

    If there is no filament loaded, the side buttons can be used to move the selector right and left. But more on that later. While in an error state, the printer is beeping. You can change the Sound setting in the Tune or Settings menu. Original Prusa MMU3 Assembly...

  • Page 141: Step 27 Mmu-To-Extruder Ptfe Tube Parts Preparation

    While the collet is pressed, first press the PTFE tube in, then pull it out entirely. Attach the PTFE tube onto the printer. One end goes onto the selector. The other goes onto the extruder. Tighten the fittings up using the Unikey. Original Prusa MMU3 Assembly...

  • Page 142: Step 29 Spoolholders Setup

    PTFE tubes should not be bent too much. Otherwise, the filaments will jam. Note that due to the decreased filament friction in the MMU3 compared to the MMU2S, some of the 3rd-party MMU2S re-winding spool holders might no longer work with the MMU3.

  • Page 143: 11. First Flight

    11. First Flight Original Prusa MMU3 Assembly...

  • Page 144: Step 1 Filament Preparation

    Filament positions are labeled 1,2,3,4,5 from the left to right, from the user's point of view. Adjust each spool holder so that the spool fits the rollers correctly. Verify the spool is able to rotate freely and nothing interferes. Take the cassette for Filament 1 out of the buffer. Original Prusa MMU3 Assembly...

  • Page 145: Step 3 Loading A Filament Through The Buffer

    MMU, until you feel the filament being pulled in. Remember, the filament tip must be straight and sharp in order to load it properly. Repeat the same process until you load all five filaments. Original Prusa MMU3 Assembly...

  • Page 146: Step 5 Closing The Buffer

    After a given filament is successfully loaded into the MMU, return its cassette back into the buffer. Repeat the same process for the other filament positions, until you successfully load all five filaments into the MMU. Original Prusa MMU3 Assembly...

  • Page 147: Step 6 Pro Tip: Loading Using The Buttons

    Note, after you issue a command to the MMU unit, wait and let it finish the operation. Don't rush. Don't play around with the printer in the meanwhile. Let it finish first if the MMU unit does something (homing, loading, unloading). Original Prusa MMU3 Assembly...

  • Page 148: Step 7 Loading Test (Part 1)

    If there are lines instead of some of the solid blocks, it means the Filament sensor in the extruder is providing an intermittent reading and might require some aditional tuning. In case several loading retries fail, a corresponding error screen is shown. Original Prusa MMU3 Assembly...

  • Page 149: Step 9 Z Axis And First Layer Calibration (Optional)

    PrusaPrinters.org profile to download a pre-sliced G-code. Or go to the folder Prusa3D/Sample objects/MMU3 via the link on your desktop. The link installs together with a full installation of the PrusaSlicer. load the PLA_Sheep_200um G-code to SD card and insert the card into your printer.

  • Page 150: Step 11 Print & Follow The Handbook

    If you are having any issues while printing, follow the on-screen instructions or visit the link from the LCD screen. STEP 12 Printable 3D models You can start by printing some of our test objects that can also be found at www.printables.com Original Prusa MMU3 Assembly...

  • Page 151: Step 13 G-Code Preparation / Custom Model Preparation

    MMU Painting's Smart-fill function later on in PrusaSlicer. If you have an intricate STL file that can't be MMU-Painted easily, you can try the more sophisticated way of Splitting STL with single compact part Splitting STL into multiple parts using MeshMixer. Original Prusa MMU3 Assembly...

  • Page 152: Step 15 Mmu Single Material Operation

    You can keep up to five of your favorite materials loaded into the MMU unit. After you slice an object using the MMU3 Single profile and run the print, the printer will let you select which filament to use. There is no need to load the filaments by hand each time anymore.
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