Printrbot Simple - Filament Spool Holder (Small MakerBot Spools)

A simple filament spool holder for the Printrbot Simple. It was designed for small filament spools, like the MakerBot filament sample pack.

I plan to clean the design up a little and change out the fixed peg for two optional sizes, accommodating different sized spools.

**Update 1:** I've adjusted the rod holes so they should more easily fit. One is now slotted a bit, and both have been increased in diameter just a little.