Prusa MMU3 Buffer Multiboard Mount

This is my quick+ugly attempt at hanging my mmu3 buffer on the multiboard wall behind my printer. I wanted to get the buffer off the table and after looking into alternative buffer options I decided that the original Prusa buffer works great for me, I just needed a better place to put it.

The bracket replaces the forward foot of the buffer, and you hang it vertically with three small multiboard t-bolts. I had originally planned to make a second bracket to replace the original arm that attaches to the printer, but I found that the one hanging bracket holds it secure enough to remove/insert the filament guides without any flexing.

This is only designed to hang vertically. The supports should be plenty strong to handle vertical tension but won't support lateral leverage if you mount it horizontally. I may create additional options for horizontal mounts or mounting it sideways flat against the wall, but this was my quick and dirty solution for my needs at the moment!

Update V2 (2024-08-10): Added MMU Buffer Cap Plate to the models to replace the plate holders along the top of the buffer. After using the hanging buffer for a few days and printing a whole bunch of multi-material prints I discovered that the vertical orientation allowed filaments to “escape” the buffer through the gap along the top when retracted from the printer. This caused some pretty nasty tangles if two filaments overlapped outside the buffer. I suspect this isn't an issue when placed upright because gravity helps keep the filament down. Covering the gap appears to have completely fixed the issue.

(Note: I don't know if the cap plate is technically a remix of the plate holders since I completely recreated the model myself in openscad, I did not modify the original model)

Prints needed:

• 1x MMU Buffer Multiboard Mount
• 1x MMU Buffer Cap Plate
• 3x Multiboard small thread t-bolt

Instructions: (referencing original part names from MMU3 printable parts)

1. Remove the original “leg-R4” from the buffer, save the m3 screws
2. Using the same m3 screws attach the MMU Buffer Multiboard Mount to the buffer with the mounting plate facing “up” away from the buffer. The back of the plate should be flush with the back half of the buffer.
3. Remove the two “plate-holder-R4” from the top of the buffer and replace them with the MMU Buffer Cap Plate
4. Remove the “buffer-holder-R4” from the bottom of the buffer and replace it with one of the “plate-holder-R4” that you removed from the top in step 3.