Filament guide for FT-5. These allow you to run a bowden tube before the extruder to prevent filament snags, it also ensures even pull on the filament no matter the position/movement of the extruder.
There are two versions, one is chamfered at the bottom and the other is made to accept a bowden tube. I prefer the bowden bottom to keep the filament supported right up to the spool.
Bowden tube, and an M4x12mm screw and t-nut are all that is needed. No bowden fittings are necessary.
Works great with this spool holder: http://www.thingiverse.com/thing:1747792