Summary

Secures to the side of a standard 20mm rail with a pair of T-nuts (as long as you don't over-torque them). Suuuper smooth rolling with my Monoprice filament on my Kossel 2020; the top has a rounded face to help prevent your spool from "catching" on it.

Printing is fairly straightforward and shouldn't need support material. 0.8mm walls with 10% infill is more than strong enough.

Happy printing!