Parametric Spool Roller

Update: 13-02-12: Updated the scad file, with guards, and stl with larger radii under where the bearing should sit. I was having an issue with clearance while printing so I added 1mm of space.
Update 13-02-10: Updated the scad file with some spool guards on the outside of the frame. Should help the spool from falling off. I may need to add them on the inside as well but I am hoping that since the roller is one piece the outsides will be enough.

Derived from thing:22579 as there were a cou