This is a simple filament spool holder that is constructed from a couple basic parts from Josef Průša's core Prusa Mendel GitHub repository: https://github.com/prusajr/PrusaMendel.

It's made to hold a Ultimachine-style spool.

To assemble this spool holder, you'll need the following parts/hardware: -Four printed bearing guides -Four printed bar clamps -Two 130mm lengths of m8 threaded rod -Twelve m8 nuts -Sixteen m8 washers -Four 608zz bearings

You just need to snap the four bar clamps over the existing top bars on your Prusa. Then thread the nuts, washers, and bearings (with guides) in the correct order onto the two 130mm threaded rods as you run them through the bar clamps. Each bar, when complete should have the following parts in this order: nut, washer, bearing w/ guides, washer, nut, washer, bar clamp, washer, nut... (~30mm gap) ...nut, washer, bar clamp, washer, nut, washer, baring w/ guides, washer, nut.