An easy way to mount your Filament spool. Suitable for filament spools with holes between 30 and 60mm, which includes filament from http://Ultimachine.com and http://Makerbot.com. If other suppliers use spools with larger or smaller openings, please let me know in the comments and I will update the model if possible.
Print two copies, insert 608 bearings and mount on a 8mm or 5/16" rod. Insert one spool insert on each side of your spool, and hold in place with nuts on your threaded rod.
The design allows for use with one or two bearings per side. One should be sufficient, but use two if you need a bit more stability.
The STL prints upside down to make removal of the finished part easier.