Spool holder / roller for MP Select Mini. This will hold the regular sized spools as well as the smaller ones.
A little background if you care to read. Goal was to design a stylish, badass looking, over-engineered, impractical non-cost effective roller.
(1) 1/4” threaded rod, 92mm in length (recommend cutting it a bit shorter, 91mm works) - home depot
(3) R4-ZZ ball bearings 1/4”(ID) x 5/8”(OD) x .196”(Width) - eBay
Screw rod into spool_holder, refer to photo for proper sequence of parts.
For spool_holder, should probably print at 100% infill. I did 50% with 3 wall thickness and it's strong, but hey, strong is better than weak.