Mount a spool of filament to your prusa i2. Spool turns smoothly on 4 bearings while being held center by 2 tabs on each side. Clamps on to the 2 top threaded rods. Adjustable for different spool lengths.
Optional filament guide prints with overhangs on a small surface area. Set minimal layer time to 15 or 20 seconds if not using support material.
Spool Holder prints flat. Use whatever settings you like. Requires 4 20mm x 8mm radial bearings, bolts,washers and nuts.