English
1. Introduction
Step 1 of 29 (Chapter 9 of 15)
Contents
Comments
⬢In this guide, we’re going to modify the Nextruder on your MK4/S, MK3.9/S to accomodate the MMU functionality.
If you are using another printer type, please refer to the respective chapter for the given printer.
The MK3.9/S printer is functionally equivalent to the MK4/S.
The instructions are shown using the MK4 printer, so some parts may look different. This does not affect the procedure.
⬢Unload filament from the printer and remove the spool holder.
⬢Make sure the extruder on your printer is in the middle of both the X and Z axes.
⬢Power off your printer and disconnect it from the power.
Contents
Original Prusa MMU3 Assembly (includes upgrade from MMU2S)
- 1. Introduction
- 2. MMU2S Disassembly (UPG)
- 3. MMU2S Buffer Disassembly (UPG)
- 4. Idler Body Assembly
- 5. Selector Assembly
- 6. Pulley Body Assembly
- 7. Spool holder Assembly
- 8A. Cassette Buffer Assembly
- 9A. MK4/S, MK3.9/S Nextruder mod
- Introduction
- Spare parts bag
- Tools necessary for this chapter
- Prusa Nozzle info (MK4S only)
- Nextruder disassembly (part 1)
- Nextruder disassembly (part 2)
- Nextruder disassembly (part 3)
- Nextruder disassembly (part 4)
- Idler disassembly
- New Idler parts preparation
- New Idler assembly
- Swivel disassembly
- Idler nut FS parts preparation
- Idler nut FS assembly
- New Swivel parts preparation
- New Swivel assembly (part 1)
- New Swivel assembly (part 2)
- Tension screws parts preparation
- Tension screws assembly
- Gearbox disassembly
- Main plate parts preparation
- Main plate assembly
- MMU Nextruder: parts preparation
- MMU Nextruder assembly (part 1)
- MMU Nextruder assembly (part 2)
- MMU Nextruder assembly (part 3)
- Gearbox assembly: Parts preparation
- Gearbox assembly (part 1)
- Gearbox assembly (part 2)
- 9B. MK3S+ / MK3.5 Extruder mod (KIT)
- 9C. MK3S+ Extruder (UPG)
- 10A. MK4/S, MK3.9/S Setup and Calibration
- 10B. MK3S+ Setup and Calibration
- 10C. MK3.5 Setup and Calibration
- 11. First Flight
Comments
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Brandonforgie
•
What I find ridiculous, I bought the mmu3, and have to buy the oring on Amazon, as well as a few screws(the 22mm) and the new 3x1 magnet for the sensor.
Jan Kratochvíl
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Hello. These things should be in the packaging. If you are missing them, contact our support team, as this is definetly an issue.
wbphelps
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I print TPU often. After reading this section I am worried that maybe switching back to a Prusa with MMU3 might not have been a good idea. I hope I don't end up regretting this... Really Prusa, why can't we have the ability to switch between MMU3 and not MMU3 with less effort? I don't reacall having any problems with the MK3 I had... I hope that Prusa will fix this.
Jan Kratochvíl
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Hello. It should be only disabling the MMU in the settings and disconnecting PTFE tube.
HappyKatz
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Will I need to take additional steps with the Nextruder to upgrade to the MK4S ? I ask because I'd like to go in just once, and if I will need to make further modifications to the Nextruder, I may wait on the upgrade of the MMU3.
Jan Kratochvíl
•
"Hello. There will be changes to the cooling and nozzle in the MK4S, but this upgrade can be completed in 15 minutes or less. The changes you made for the MMU upgrade remain the same.
delwilson6241@gmail.com
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I'm appalled that the Nextstruder should need modified in any way to accomodate the MMU3! Were it designed to accept the feed tube like the MK3S/MMU3 (threaded fillament feed hole) it should work every bit as well and the extensive mods to the Nextruder would not be needed.
Jan Kratochvíl
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Hello. It would be nice if the stock nextruder were sufficient, but in its current state, it is either automatic filament loading or proper MMU functionality. However, if you have any suggestions on how to improve the nextruder, we are all ears. :-)
delwilson6241@gmail.com
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That's a non-technical answer! What's different and why? All the requisit functionality seems to be in place on the original Extruder except for the interface for the fillament tube from the MU3. Make the printer nextruders MMU compatible. It can't be that hard or costly. BTW I'm a very experienced mechanical engineer with 40+ years experience In support of the USAF ICBM Program.
Jan Kratochvíl
•
Good for you! :-) But if you need an explanation despite your experience, the MMU modification to the extruder changes the FS behavior, making it register idler movement instead of inserted filament. In that case, the nextruder identifies filament only after it is in the gearbox, ensuring that it is inserted all the way through. But as I said, if you have any improvements, let us know.
MikeJoe160
•
New hobbist here. Have had my MK4 for a week and when I got to the part of "Make sure the extruder on your printer is in the middle of both the X and Z axes." I was lost for a few hours. Might want to clear up how this is accomplished. I bought my printer factory assembled, if that matters.