Hictop Filament Guide

I love the horizontal filament spool holder (http://www.thingiverse.com/thing:2074069) but don't love its tendency unspool filament all over the place, so I designed this guide.

It replaces the two nylon standoffs in the display board with a part which holds a standard teflon Boden tube coupling (the ones I had laying around were 0.375 in OD).

Now the filament feeds smoothly all the time because the amount of slack remains constant even as the head travels back and forth.

I haven't cra