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1. Preparing the printer
Step 1 of 16 (Chapter 4 of 14)
Contents
Comments
Before you start, make sure that:
⬢the filament is unloaded from the hotend
⬢the printer is properly cooled down
⬢the printer is unplugged
⬢you removed the steel sheet
This chapter is dedicated only to the MK3/MK2.5 owners. If you have new MK3S/MK2.5S, please follow: 2B. MK3S/MK2.5S extruder disassembly
The MK3 and MK2.5 have several design iterations and yours might differ from the one used as an example in this disassembly. As a result, some instructions might be not applicable to your printer (you can skip them).
Contents
Original Prusa i3 to MMU2S upgrade
- 1. Introduction
- 2A. MK3S+ extruder disassembly
- 2B. MK3S/MK2.5S extruder disassembly
- 2C. MK3/MK2.5 extruder disassembly
- Preparing the printer
- Releasing the cable bundle
- Unplugging the extruder cables
- Removing the filament sensor cable
- Releasing tension in the X-axis belt
- Removing the extruder
- Fans and motor removal
- P.I.N.D.A. probe removal
- Hotend removal
- Removing the PTFE tube
- Inserting the new PTFE tube
- Removing the Bondtech gear
- Idler disassembly
- Removing the filament sensor (optional)
- Haribo time?
- Disassembly is finished!
- 3A. MK3S+ extruder upgrade
- 3B. MK3S/MK2.5S extruder upgrade
- 3C. MK3/MK2.5 extruder upgrade to MK3S/MK2.5S
- 4. Idler body assembly
- 5. Pulley body assembly
- 6. Electronics and MMU2S unit assembly
- 7. Spool holder and buffer assembly
- 8. Preflight check & Calibration
- 9. First flight
- Manual changelog MMU2S
Comments
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P. Larsen
•
All the images I see is from the MK3S - not MK3 (where the fan is vertical, not at an angle). Is this guide still valid for MK3 (without the S)?
Prusa Product Department
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Hi, this manual can be used for an MK3 extruder disassembly. Plastic parts (fan_nozzle and filament_sensor_cover) may be different.
Morten H Pedersen
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I agree with Rick. In my case upgrading from 2.5 MM2 to 2.5S MMU2s there is no dedicated instructions and the full teardown of the extruder to rebuild it to 2.5s seems like too much work, since only filament sensor is new. Why do all the wires need to be removed from the box, and the only controller board shown is the mk3 and not the mk2.5 one. So the manual does not work with 2.5 upgrades
Filip M - Official Prusa CS
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Hi Morten, the whole chapter is also dedicated to MK2.5, so you can use this guide to disassemble your extruder. It’s very similar to MK3, with some minor differences.
Tom Heinz
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Filip M, I assume you mean after I complete this Extruder Disassembly. Jumping directly to the link you provided would by-pass this step. So, then what, after 3A?
Filip M - Official Prusa CS
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Hi Tom, I posted that assuming you have already disassembled the extruder. After you finish the part 3A you can proceed with the MMU2S assembly.
Jakub Dolezal
•
Hi guys,
'''thanks for the feedback, we are listening to your suggestions and you can see many steps or even parts of the printer have changed''', but I have to slightly disagree with you on this one.
'''Creating multiple manuals for similar printers under current conditions (site design, search options) would end up in more confusion.''' This decision was made after our experience with MK2, MK2S, MK2.5, MK2.5S, MK3 and MK3S manuals, where many users were using the incorrect version. Similar to MMU2 and MMU2S, which is often used incorrectly, even though the MMU2 is in the archive.
Just to cover the MMU2S for each possible configuration, there should be about 10 sets of guides.
'''thanks for the feedback, we are listening to your suggestions and you can see many steps or even parts of the printer have changed''', but I have to slightly disagree with you on this one.
'''Creating multiple manuals for similar printers under current conditions (site design, search options) would end up in more confusion.''' This decision was made after our experience with MK2, MK2S, MK2.5, MK2.5S, MK3 and MK3S manuals, where many users were using the incorrect version. Similar to MMU2 and MMU2S, which is often used incorrectly, even though the MMU2 is in the archive.
Just to cover the MMU2S for each possible configuration, there should be about 10 sets of guides.
Jakub Dolezal
•
'''This, however, doesn't mean we won't do anything, quite the opposite.''' I was aware of this possible confusion months ago while writing these new MK3S/MK2.5S/MMU2S manuals and tried my best to write the instructions to guide you safely through the entire process. In the mean time, we started working on a solution. In the future, you will get the exact set of steps for each printer, but it requires a huge amount of work to be done. For now, I will do my best to clear the most confusing steps.
Thanks Jakub
@ttenrubr @epeleg @heinzight @echer80111
Thanks Jakub
@ttenrubr @epeleg @heinzight @echer80111
Eitan Cher
•
I completely agree with what Rick said. '''Having many manuals to choose from is NOT a problem for the user.''' What is a problem for the user is not finding a manual that is clearly meant for their printer configuration. I get that it is easier for you guys to combine manuals, but it can be really confusing for your users.
For example, I currently have a MK2.5 MMU2, and I just received a box containing an upgrade from MMU2 to MMU2S. There is nothing in the list of guides that is clearly meant for my situation (based on the titles). There should be a guide titled something like “MK2.5/MK3 with MMU2 >> MK2.5S/MK3S with MMU2S”. Instead, I had to just make my best guess and dig around in this guide.
Please consider fixing this.
For example, I currently have a MK2.5 MMU2, and I just received a box containing an upgrade from MMU2 to MMU2S. There is nothing in the list of guides that is clearly meant for my situation (based on the titles). There should be a guide titled something like “MK2.5/MK3 with MMU2 >> MK2.5S/MK3S with MMU2S”. Instead, I had to just make my best guess and dig around in this guide.
Please consider fixing this.