Adjustable Tabletop Spool Holder

A compact, tabletop spool holder which has a tool-less width adjustment allowing for various brands of spools. Uses 4x [625ZZ bearings](https://www.amazon.com/gp/product/B01M6BY2MU/) that have 5mm ID,16MM OD with 5MM width, all other parts are included.

This holder is designed for printers that don't have their own spool holders, and don't use bowden setups (although you may find this works for yours, I haven't tested it).

Originally built for a Printrbot Maker's edition, which it served w