Bit of a long one, I keep killing steppers and am now at a loss on whats causing it:
New build CR10 clone using a Tronsxy as a base, 400x400
Duet wifi 2.02(RTOS) (2018-12-24b1)
12V 30 amp power supply, fused at 20amps, with a seperate 30amp supply for bed run through mosfet
Steppers set to run at 1000ma
17HS4401S stepper motors on the latest build(see below)
Steppers are slightly warm to the touch when running on bigger prints, slightly as in 5-10 degrees, not very much at all.
Dual Z motors wired in parrallel
I did have a motor with an internal short on the Y axis originally, there was a solder bridge causing me issues with the original build. Repalced with a spare and worked fine after a lot of troubleshooting. I also had 2 of the original cables with internal breaks in the wire (troubleshooting all that was fun!). All fixed, new wires purchased and all repalced.
Setup the printer with the motors originially supplied, they are nominally 1.5 amp motors but if the quality of the rest of the original is to go by could be anything. After very light usage, just setup and calibration I could stall the X and Y motors with one finger, replace the motor and it went back to usual levels of torque so assumed dodgy motors.
Have now repalced all steppers with the above 17HS4401S. After calibration and started a long print, and have now killed the Y stepper again. Fitted motor can be stalled with finger, fit a spare stepper and I cant stall it.
Print qualty is excellent when running, until the motors break down.
Probably unrelated but worth noting: when I use z hop the z motors do not return, they go up and dont drop down creating a missing layer. Watched it do it with the 20mm calibration cube. Its not intermittent its every single z hop. Have seen this being attributed to binding on z. Can set Z0 and run the carrige to the top and down again back to the same z0 with no odd noises. THis is not what Im asking for help with here, need to solve the motor issues first but figued worth noting)
So....where do I go from here?
I did not watch the long print, so dont know if the motor got hotter. Can fit heatsink and fan to motors but really should not have to?
Noticed a recomendation to ground the motors which I have not done yet.
I cant keep replacing steppers, they are not that cheap. Any suggestions for things I can test?