⬢Please prepare tools for this chapter:
⬢2.5mm Allen key for M3 screws
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- Original Prusa MK4S with MMU3 (assembled bundle)
- 2. Cassete Buffer Assembly
2. Cassete Buffer Assembly
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- Original Prusa MK4S with MMU3 (assembled bundle)
- 1. Introduction
- 2. Cassete Buffer Assembly
- 1. Tools necessary for this chapter
- 2. Parts preparation
- 3. Peeling the plates
- 4. Assembly (part 1)
- 5. Assembly (part 2)
- 6. Assembly (part 3)
- 7. Assembly (part 4)
- 8. Assembly (part 5)
- 9. Parts preparation: Plate-holders
- 10. Assembly (part 6)
- 11. Buffer segment parts preparation
- 12. Segment assembly (part 1)
- 13. Segment assembly (part 2)
- 14. Segment assembly (part 3)
- 15. Collets: parts preparation
- 16. Collet installation
- 17. Cartridge installation
- 18. PTFE tubes parts preparation
- 19. PTFE tubes installation
- 3. Spool Holder Assembly
- 4. Preparing the assembly
- 5. Preflight check
2. Cassete Buffer Assembly
Relevant for:
Last updated 6 months ago Difficulty
Moderate Steps
19 Available languages
⬢For the following steps, please prepare:
⬢Buffer plate (6x)
⬢Printer holder (1x)
⬢Buffer-leg (1x)
⬢Segmenter (1x)
⬢M3x30 screws (6x)
⬢M3nS nuts (6x)
⬢Peel the protective layers off the both sides of the buffer plates.
⬢Insert the protruding parts of the Buffer leg into the marked openings in the Segmenter. Push it all the way in.
⬢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.
⬢Insert the first buffer plate into the marked bottom opening in the Segmenter. Push it all the way in so that the screw openings line up.
⬢Make sure the buffer leg and the cutout parts of the sheet are on opposite sides - as seen in the picture.
⬢Attach the printer holder to the marked position on the buffer sheet. For now, it should be pointed up. The sheet should attach to the bottommost opening in the printer holder.
⬢Orient the whole assembly so that the buffer sheet is standing up. Both the printer holder and the Leg should be on the ground.
⬢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.
⬢Insert three M3x30 screws into the marked openings on the side of both the Segmenter and the Printer holder. Tighten them up.
If the screw doesn't go in, make sure all the holes align with the plates.
Do not overtighten the screw. Otherwise, the buffer plates might deform.
⬢Attach another two M3x30 screws into the openings on the other side of the Segmenter.
⬢Insert the last M3x30 screw into the marked opening in the Printer-holder.
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.
⬢For the following steps, please prepare:
⬢Plate-holder (5x)
⬢Attach the plate holders to the plates in the marked positions.
⬢For the following steps, please prepare:
⬢Buffer Segment (10x)
⬢Wheel (5x)
⬢Ball Bearing 693-2rs (5x)
⬢Shaft 2.9x8.5 (5x)
⬢M3n nut (15x)
⬢M3x6 screw (25x)
⬢
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.
⬢Insert three M3n nuts into the marked openings on the Segment and push them all the way in.
⬢Add the wheel into the center of the segment.
⬢Push the Shaft all the way through the middle of the bearing, until it engages into the segment below.
⬢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.
⬢Assemble all the remaining segments, using the same technique.
⬢For the following steps, please prepare:
⬢Collet (10x)
⬢Insert one of the collets into the marked position on the cartridge.
Note, for an easier instalation, you might want to squish the small fins together while you insert the collet into the opening. 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.
⬢Now, prepare all 5 cartridges and the buffer body.
⬢Take one of the cartridges and hold it by the two handles. Squish the handles together for insertion.
⬢Insert the cartridge into the buffer body.
⬢Make sure the cartridge is properly inserted.
For a later cartridge removal, squish the two handles together and pull it out.
⬢Insert all the cartridges into the buffer body.
⬢For the following steps, please prepare:
⬢PTFE 650mm (5x)
⬢PTFE-clip (1x)
⬢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.
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