Prusa MMU2 filament rewind guide

thingiverse

KIS ... :-) This solution to the filament rewind / buffer issue with the MMU2 is very simple utilising an empty capture spool between the actual filament spool and the MMU2. Rewind systems using springs or weights have the reported drawback that they can tug the filament out of its MMU2 pre loaded position this solution will not. My preference is to go vertical as per the photos but it should work horizontally. This simple PLA guide is attached to the vertical wall just beneath the capture spool to hold the 4mm PTFE tube at the optimum angle for the slack filament to store on the capture spool. I used a strip of Velcro glued and stapled onto the wood wall to hold them in this position. The filament is first wound with three or four loops around capture spool. The guides are easily removed to assist with loading and aiming. A 4mm nut & bolt can be used to clamp the PTFE tighter. The actual capture spools in the photos I made as I didn't have sufficient empty spools available and I made them 30mm internal width but I don't think that will make any difference to just using empty spools. Take note it really needs +50% infill for strength. Good luck Graham