This version is specifically made for Hatchbox spools. I wanted to add an arm to guide the x-axis motor wire so that it wouldn't risk getting tangled up in a filament spool. My 3D skills are lacking, so I may clean this up a bit later. It's missing a rounded edge I wanted on the top where the wire would rub to make the wire movement smoother. EDIT: Just uploaded a 2nd version, this time made with 123D. Much cleaner and included rounded edges to allow nicer treatment of wire. Original parts from: http://www.thingiverse.com/thing:652415 Also added a 31mm spacer, which should fit the Hatchbox spool better. Having problems with it so print at your own risk (of wasting filament...)