M3D spool holder

Probably the easiest way to make a filament holder for small M3D rolls on your M3D printer.
The internal filament gets trapped sometimes in my M3D so I chose for an external solution.
It only requires one printed part (which can be printed on an M3D) and a paint roller set which you can get at any hardware store.
The printed part is designed for paint rollers with a 6mm round metal roller bracket.

There is a filament holder for 1Kg rolls available as well: http://www.thingiverse.com/thing