Roller Spool Holder for Prusa i3

This is a replacement spool holder for the original Prusa i3 Mk2/Mk2S 3D printer using common, easy-to-obtain 608 bearings for less friction. In the original Prusa spool holder, the spool rests on little stubs. Unfortunately the spool tends to rub on the stubs and the additional friction causes the filament to pull on the print carriage during printing. This holder also retains the spool more securely while still allowing easy spool changes.

The roller w/bearings is mounted on a 1/4-inch a