Prusa i3 MK2 Spool Holder

A Monoprice-style filament spool holder for the Prusa i3 MK2. Makes switching out spools easier. Prints as a single part without supports. Use high infill, approximately 40%, and at least 3 walls, for a strong part.

Update 2/28/17: The v2 file includes the following changes: 15mm taller height to accommodate more spools, and a reduced height and thickness on the front frame overhang to fix an issue where the extruder assembly would rub if fully raised.