A Geared a...ddon 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