Filament Guide for Up! with Integral Filament Cleaner

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Having gone through a couple of nasty nozzle clogs, I'm determined not to go through that again if I can help it. This design cuts down on the likelihood of a clog due to dust etc. by passing the filament through a small chunk of open-cell foam. The foam is held securely inside this guide so you don't have to deal with a loose piece every time you change filament. Instead of offsetting the guide to the spool's edge, I designed it to mount right on the centerline and pivot in response to the amount of filament on the spool. This guide also provides air connections for forced-air cooling schemes like this one: http://www.thingiverse.com/thing:26706 giving you a secure anchor point for the air feed hose and allowing you to disconnect the compressor hose without disconnection the hose that feeds the extruder head. I created this design with TinkerCAD, so feel free to edit it for your own purposes here: https://tinkercad.com/things/7TdiCS8fsuQ-filament-guide-head and here: https://tinkercad.com/things/0FKbVaAoFds-filament-guide-bracket. Printing the parts is the first step. Next, screw the head onto the bracket with an M4 machine or self-tapping screw. I added a rubber washer between the two to make the assembly non-floppy, but it's not essential. Just tighten the screw enough so that the head can pivot as needed by the extruder. Cut a chunk of foam to fit roughly inside the foam compartment (1 x 1 x 3/4") and stuff it in. Then bolt this guide to your Up! machine. Finally, poke filament through the foam up into the filament guide tube.