Variable Diameter Bearing-using Spool Holder

This is a spool holder to use vertically. It requires mounting to a vertical surface and spins onf two 608 bearings. The spool-holder is removable and sits in the base using a key system so that one can change it out depending on the size of the filament spool being used.

Designed for use with the I.S.A.A.C. 3-D printer shell (http://www.thingiverse.com/thing:334685)