Simple Spool Holder for Printrbot Metal

The most compact way to add a filament spool "inside" a Printrbot Simple Metal.

This spool holder prints in one piece and it fits the bed in the design orientation. As designed it should fit most spools (up to 92mm wide and 200mm diameter) but just in case you need to modify it I have included the OpenSCAD source as well.

You need need a M3 22mm screw to mount it (you will use it instead of one of the M3 16mm screws).

Background: I wanted a spool holder that kept the spo