Super Simple 1.75mm Bowden Extruder

Update 1/30/2016: Further updates to this extruder design will be published as part of the FuseBox 3D printer at http://www.thingiverse.com/thing:1047193 instead of this page.

V2 Update:
- Increased tolerances for idler arm to simplify assembly
- Tilted tensioner mount for more idler pressure

This is a super-simple, compact bowden extruder designed to use as little parts as possible. It is a direct-drive design, using an MK8 drive gear and a 625 idler bearing. This extruder has been