champ1981 0 Posted January 30, 2017 in Replacement of feeder stepper motor, UM2 Can anyone confirm the correct feeder stepper motor for the UM2. I have a failed stepper motor, so i removed the original which had the following part number on it SY42STH47-1684AW I was unable to get this part number, but found the following part number from a company called Zapp SY42STH47-1684A I got one of these and replaced the old one. The motor now works, but runs very fast, I would guess at twice the speed. Does anybody know whats happened, have a replaced with an incorrect part? Why would the motor runs so fast. Any advice appreciated. Share this post Link to post Share on other sites
neotko 1,354 Posted January 30, 2017 in Replacement of feeder stepper motor, UM2 (edited) Your new motor is 200 steps/rev, the um2 feeder motor is 400/ step/revolution You would need to change the esteps to half your current amount Google on this forum (search uses google) change estep um2 https://ultimaker.com/en/community/21533-where-to-edit-firmware-esteps-for-um2#reply-149473 Mind that in that post the estep number isn't the one you need, I don't have the um2 esteps at hand, but I think you get the idea? Edited January 30, 2017 by Guest Share this post Link to post Share on other sites
