PTFE Tube Shelf Edge Holder

The MMU3 buffer and filament rolls with the Prusa Enclosure are tricky to configure, as all rolls and buffer must either be mounted to the enclosure (which faces the buffer cartridges rearward) or placed on a shelf somewhere. Additionally, the R4 spool holders require the user to feed the filament from the bottom of the roll, which can be tricky. This PTFE holder reuses and adapts the R4 PTFE holder and allows the PTFE tube to run directly up or down from the edge of a shelf. This permits easier feeding of the filament from the user-facing side of the roll, rather than underneath as in the original model. 

To use, place your filament boxes or the Prusa spool holders together on the shelf in the configuration you like, and mark the center of each roll on the shelf edge. Line up the tube holders and mark, drill, and screw in each holder to the shelf edge. Press the PTFE tube into the holder in the same fashion as it was with the original holder. You can now feed the filament from the front of the roll, easing filament loading and unloading.

If you have dryboxes or filament dryers, the shelf holders can still be used to secure the PTFE tube to the shelf edge in the correct position. Simply push the PTFE tube all the way through and feed it to the drybox or dryer.