Rounded loop guide clip for threading filament. For use on MakerBot Cupcake 3D printers. Fits snugly on any of the laser cut body. I mounted mine on the inside lip as shown in the photo to keep the filament from getting tangled in the Z stage belt.

Based on:
Filament Guide for Tall Cupcakes v1.0
by Derek Quenneville techknight@techknight.com
http://www.thingiverse.com/thing:31907