Version 'Metal' (beta) at https://www.youmagine.com/designs/metal-geared-addon-inspired-based-on-meduza-bolt-on-addonA Geared addon for my extruders. I use UM2 feeder motor 0.9º on my UMO+ with MK7, my esteps with this on where 478.5 (divide /2 for 1.8º motors) Btw you might need to set the motor on reverse to make this work on a UM2. On umo/umo+ you might need a different kind of grip that the ones on the photos or the IRobertI feeder would hit the wood. Long story short. The Gear ratio it's 2.36:1 and I generated the gears using geargenerator.com The design it's based on the Meduza "bolt-on" geared feeder upgrade for UM2: https://ultimaker.com/en/community/17033-meduzas-bolt-on-belt-geared-feeder-upgrade-for-um2