Filament Guide with Festo M10, for Prusa LACK Enclosure v2

This filament guide is designed to be used with the Prusa Enclosure v2. I am using it with a MK3S+, the MMU3, and the new buffer with cassettes, which allows the PTFE tubing to come down through the LACK enclosure and at a good down angle into the buffer cassettes. Of course, the included tubing pieces weren't long enough, so I had to add my own tubing.

Here is the OnShape design project, if you would like to remix. The circular part at the top, with the Festo connector threads and the filament funnel is taken from Festo M10 Mount by Florian Steiger.

Recommended parts

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• PC4-M10 Festo-style connectors (you only need 5, but it's just as cheap to get extras)
• PTFE/Teflon Tubing, OD 4mm, ID 2.5mm, 10m length, to match the new tubing used with the MMU3 (you probably only need 5m, but I got more so I could make mistakes)
• Small wood screws, to attach the guides to the lid of your LACK enclosure, 3 screws per guide, 15 screws in total

Assembly

1. I recommend printing 5 copies of this guide, with support only on the bed,  inside the M10 screw area, so that the printed filament funnel on the opposite side doesn't collapse during printing, or end up with a lot of extra sagging filament that obstructs the filament hole in the center.
2. Clean away the support material, and screw the Festo connectors into the guides.
3. Use the wood screws to secure the guides to the top of the LACK enclosure, roughly 5 inches (125mm) away from the center of each spool, with the Festo connector pointing toward the rear of the enclosure
4. On the rear right corner of the lid of the enclosure (assuming the buffer cassette inputs are also located in the rear right), drill two ¼" (~6mm) holes about 2 inches (~50mm) apart, and then cut the space between them, to create an oblong, stadium shaped hole for all of the tubes to pass through. I have tried smaller individual holes for the PTFE tubes before, but this placed compression on the tubes, and thus extra friction on the filament, which can cause problems.
5. I recommend inserting the new PTFE tube at the buffer cassette first, and then measure to the guide location, giving it a nice, gentle curve in the tube, so the filament doesn't have to go around any sharp bends.
6. Cut the tube to the measured length, and insert into the Festo connector on the guide. Repeat for all five guides.
7. Feed the filament through the guides, tubes, and buffer, to load to the MMU.

I will try to add more photos of the full install soon. Thanks for looking!

I trimmed the Festo M10 Mount to the essentials for feeding filament, and screwing in the Festo connector. This was added to the top of two arms, to put the Festo Mount at an average height for the filament coming off a standard size roll.