About this 3D model

Realized that I was using both a filament guide (http://www.thingiverse.com/thing:22649) and a spool holder (http://www.thingiverse.com/thing:20710/), but the filament guide was just wedged into place. By attaching the filament guide to the spool holder, it's held firmly into place. And by fitting into the slider in the parent design, the filament holder can be adjusted to suit the particular filament and spool.