Unofficial MMU3 'Quality' print GCODE and Process for PRUSA MK4 (July 2024)

As of July 5, 2024 the official GCODE for printing the MMU3 printable parts is done with the Print settings configured for ‘SPEED’ rather than ‘QUALITY’ and makers (myself included) have reported problems using the provided file. This page provides a set of unofficial, alternative GCODE files built for the MK4 in PrusaSlicer 2.8.0, using the ‘Quality’ Print settings.

Additionally, the process for building the MMU3 does not include separate steps for printing necessary parts, or summarize the time/effort this process will take. I made this document because I needed to and because I love you. You'll probably want between 1 and 8 additional packs of gummy bears for this.

When the official GCODE has been updated/fixed, and an intelligible process document has been written for printing them, I can take this down. PRUSA makes the best process documentation I've ever read, and I'm sure it will fully replace anything I can produce here.

If you are thinking about purchasing the MMU3, and you're wondering if it's worth $30 to get the parts printed, OR if you should print them yourself with the 3D printer you already own, in my opinion, it's absolutely worth $30 to have them printed for you.

Summary

The MMU3 is shipped with 800g PETG Prusament so fool-hardy makers can print a bunch of the parts themselves. This filament is provided in 1 400g spool loose in the box, and 1 400g spool in the Fasteners box. To fully assemble the MMU3, 8 print jobs must be successfully completed with an estimated print time of almost 48 hours.

1. Dry out freshly opened PETG Prusament
   Makers (myself included) found that the packaged PETG Prusament performed better after a 4 hour drying cycle.
   • https://www.wevolver.com/article/how-to-dry-filament
2. Print mmu3_unit1
   Unit 1 contains the idler body and the pulley box
   • ETA: 12h46m
   • Consume 1/8th of all supplemental gummy bears purchased for this process.
3. Print mmu3_unit2
   Unit 2 contains the idler and a bunch of other assorted parts
   • ETA: 11h18m
   • Consume 1/8th of all supplemental gummy bears purchased for this process.
     
     With mmu3 unit 1 and 2 complete, you are now able to follow sections 4,5 and 6 of the MMU build guide.
      
4. Print mmu_buffer1
   Buffer 1 contains the supporting files for the cassette buffer
   • ETA: 7h34m
   • Consume 1/8th of all supplemental gummy bears purchased for this process.
     
     After successful printing of  a couple test/configuration prints, unit 1, unit 2, and buffer1, I had completely consumed one of the 400g spools of PETG.
      
5. Print mmu3_buffer2 Five(5) times
   Buffer 2 contains some wheels used to handle slack that develops during the filament changing process. You'll need to print this gcode 5 times.
   • ETA: 16h05m (3h13m x 5)
   • For each cassette printed, consume 1/5th of all supplemental gummy bears remaining.
     
     With the buffer and cassettes printed, you are now able to complete section 7 of the MMU build guide.

Assembly of the Spool Holders does not require any printed parts. You can complete section 8 of the MMU build Guide.

Modification of the Nextruder requires the replacement of parts with new ones provided in the MMU3 kit. 

User-Made unofficial GCODE files for printing the official MMU3 parts on a default PRUSA Mk4 printer.
GCODE fixed to use the "Quality" setting.

Most importantly, Description includes a ddetailed Process for printing all necessary parts.