Replaced my stepper motor, now get an instant calibration failed error. Any suggestions?
RE: Replaced my stepper motor, now get an instant calibration failed error. Any suggestions?
A MK3's standard firmware is tuned to the stepper motors supplied with the original printer.
Obviously, both the left and right Z-axis stepper attached lead screws and trapezoid nuts must also be paired and physically identical or you'll have the x-axis tilting as it moves up and down on the z-axis because one side will move vertically at a faster rate per step.
Check that the trapezoid nut on the left side z-axis is identical to that on the right and both are mounted in the correct top/bottom orientation as pictured in the MK3 assembly manual. Having the trapezoid nuts mounted upside down will also fail your calibration as the calibration routine also checks the detected z-axis length via the number of steps required on both steppers to move from top to the bottom of the z-axis.
Better still buy an official replacement from the MK3/MK3S spares in Prusa's store for about USD 32.86 (+postage, etc.). You'll have to logon to your "Prusa account" in the store to see and access the Spare Parts section. The url for a replacement left Z-axis stepper is https://shop.prusa3d.com/en/spare-parts/385-stepper-motor-z-axis-left.html
RE: Replaced my stepper motor, now get an instant calibration failed error. Any suggestions?
@jonathan-lin
I used the same trapezoid nut from the broken motor and mounted properly. I tried purchasing an official replacement but it's only letting me at to wish list even though it says in stock.
Thanks
RE: Replaced my stepper motor, now get an instant calibration failed error. Any suggestions?
@david-m122
You'll need to use the matched trapezoid nut that came with the new leadscrew stepper motor especially. The leadscrew and nut must have matching specifications. If the screw pitch, type, or other specification differs between the screw and the nut then you'll have issues.
For the Prusa I3 MK3s z-axis both leadscrew steppers must match.
As per ordering a replacement from PRUSA, it looks like the COVID-19 is affecting availability at this time.