Makerbottable Simple spool system

Depreciated: This item has been replaced by version 2, a 100% printable spool holder, located at http://www.thingiverse.com/thing:8317 Please refer to that file, which is a much better design.

I liked BrokenToaster's idea of a bearing-driven filament spool holder, but that version was too big to fit on a Makerbot print bed. I separated the arms from the hub, making a tight-fitting dovetail joint to connect the pieces without any hardware. It now fits on a Makerbot print bed!!!