Prusa MMU2 Filament Retract Bank Guide

thingiverse

Designed to complete this project: https://www.thingiverse.com/thing:3373895. Based on the drawing from David's design document, I opted against buying materials and tools required for making it out of plexi or other materials, so I decided to print it instead. Two versions are included: one for the full size as designed (305mm) and another that fits within my Prusa i3 Mk3 print bed with a little room at the edges (240mm). Although filament will extend beyond the guide when fully retracted, this happens regardless, and shouldn't interfere with functionality. The front piece was printed with extra perimeters and no top or bottom layers, while using a honeycomb infill at 10% so that I could easily verify the filament is loading/unloading properly. Screw holes were added for assembly or even just to align and hold while gluing; they are made for M3 screws and fit through the front piece with enough friction to hold them together. This model has functioned well for myself and others, so I have removed the WIP indicator. Version History: v2.1 - Added "extension" models to lengthen the bank, which should only be needed if you've extended the PTFE from the MMU2 to the extruder for some reason (like mounting the MMU2 on something other than the frame of the printer). It is designed for wall mounting. v2 - A chamfer was added to the back edge of the front piece to help prevent filament catching there during retraction. This has not been tested yet, but should work fine. v1 - Original version