Filament Spool Holder

This is a replacement spool holder for a RepRap G3D (Prusa i3 design from Gadgets3D). It utilizes an M8 threaded bolt and a set of four 608ZZ ball bearings. The mount attaches directly to the existing frame bolt pattern. I have found this arrangement to work very well with my printer.
2016-01-24 Update:
- Cleaned up Sketch up file.
- Added universal spindle (is concave and should fit almost all spool cores)
- Inner spindle ridge is now a pentagon and no longer a support that must later be removed
- Slightly enlarged Mount to better match larger universal spindle