The UNF#cker 2 - a dynamic dual-head filament guide

I keep two spool holders on top of my old direct-drive Ender and routinely do color swaps, so I wanted a way to keep the spools neat but also be ready to feed and retract quickly.

I had modified and printed another feed guide but wasn't thrilled with it. As compared, this one supports two spools, changes angles as the print head moves to keep things from binding up, is about 10mm higher up off the plate to provide clearance for the print head and it's cables, and uses the more common M3 bolts.

Thus, the "UNF#cker 2" was born - a simple print-in-place model that attaches to extruded aluminum frames using two M3x10 TNuts. No supports needed, prints great a .2. Strong enough with just basic PLA.

Two little holes in the gimbals will accept 9mm of 4mm OD PTFE tubing and freely rotate about 50°. The bottom of the holes (as printed, the top) has a little catch to prevent the PTFE from going completely through - please only insert the tubing from the more open end. The holes are very low-poly as this provides a nice, snug friction fit for the PTFE so there's no need to rough them up or glue them in. I took a leftover piece of Capricorn tubing and pushed it in then used a #4 hobby blade to cut it flush. The tighter the ID on your PTFE tubing the better, as it's such a small piece. I had some other tubing with much more open IDs that was too loose in testing.

Two models are provided - one with and one without the text. I colored mine with sharpie since I wasn't going to add three hours to do color swaps on the X1, but the old filament I used soaked it up and bled a bit.

I also made a little video showing the UNF#ucker in action.