Free
Added a PC4m0 connector to the end of the MMU3 PTFE guide part for the spoolholders.
Also swap in ball bearings for your plastic wheels using this easy mod to reduce rolling friction- https://www.printables.com/model/858747-ball-bearing-kit-for-mmu3-spoolholder
Names are used only to indicate the source of a result. Polyzon is not affiliated with the listed sites.