Lack Enclosure MMU3 PTFE Routing for RMU MK3

With the original Prusa Lack Enclosure working well, I wanted to route my filaments similarly to how they were setup with the MMU2S previously, but now with an internal RMU MK3 buffer and an upgraded MMU3 with less friction.

The through-hole part gets glued in place from the bottom, and the lid is removable from the top. This makes it easy to take the lid off with no tools, and easily replace it with the bottom section through the lack enclosure glued in place.

To modify the lack enclosure:

1. Use a compass to mark a ~60mm circle, and cut a hole through the top of the Lack enclosure. You'll have to locate the circle on the top and bottom of the Lack enclosure lid, and make sure they are lined up +/- 2mm.
2. Remove the inner cardboard where the holes are
3. Print the “passthrough” and glue it into the new hole from the bottom (I used CA+ superglue).
4. Print the “cap” and place it in the top.
5. Route your PTFE tubes through the gap between them.

The spool-feeder parts are used to terminate the PTFE tube right next to your spools. They take an M10 threaded PC4-M10 connector.

Like other printer-related parts, I recommend printing these in PETG.