Spool holder

Spool rides on bearing allowing it to freely spin, reducing the friction in the line. Designed to work on 20mm extruded aluminum.

Only part that May be harder to replicate is the bent piece of sheet metal. Unfortunately I did not make a template, was a trial and error experience for me. Although not required, this latch helps keep part B from shifting when printing and changing filament.
Part B may also be turned around when installed to allow wider spools.

I recommend using Fast Eddy Bearings, may be cheaper than Traxxas branded.

m3 x 7 screws X2
m3 x 3 Brass threaded fitting X2
Traxxas 5119 (10x15x4mm) Bearing X4