Gear bearing spool holder for Prusa Mk3

myminifactory

Gear Bearing, Customized as Prusa Mk3 Spool Holder Improvement. This part fits perfectly on 2018 and 2019 T-shape spool holders from Prusa Mk3 for two spools. Printing this gear bearing with a lower friction ratio than the spool directly on the bar is challenging. However, so far, the bearing seems to be only slightly better. The extruder motor doesn't care about the difference, but these two problems can be significantly reduced. 1. Swiveling of the spool caused by small alternating movements of the filament when the spool does not advance but keeps the same contact point due to static friction. 2. Filament on the spool building knots due to chaotic winding filament on the spool (Prusament doesn't have this issue, but some cheap ones do). In theory, less force on the filament for rotation should mean less force tightening those knots. I obtained the original gear bearing from https://www.thingiverse.com/thing:53451.