This is regarding the circuit of my 3D printer mainboard.

I had an obersvation: It has a cooling fan (40X10 24V) which is having issues lately - it stops working sometimes, and when pushed to rotate, spins back.

Now one of the stepper motors (NEMA 17 ~3.5kgfcm) in my core XY has been malfunctioning, where it misses rotation sometimes out of the blue, which shifts the whole print. I thought this is due to the driver limiting the current to the motor, so I rotated the screw terminal clockwise a bit more to allow more current for the motor. This works fine for a while, but the problem comes back.

Now, I also noticed a few times that this issue occurred when the cooling fan for the drivers stopped working.

Can the stopping of the cooling fan cause the stepper motor to falter?

  • \$\begingroup\$ Another observation is that the stepper motor which is faltering is placed close to another stepper motor. Although I know stepper motors can work in extreme conditions, can this cause the issue? \$\endgroup\$ – jash101 Jun 27 at 13:37
  • \$\begingroup\$ Monitor the motor power supply. Is it stable at the correct voltage? \$\endgroup\$ – Brian Drummond Jun 27 at 13:39
  • \$\begingroup\$ Thanks for your comment Brian, excuse my limited knowledge, how do I check the motor's power supply? It's a SMD PCB, so I won't be able to change any connections \$\endgroup\$ – jash101 Jun 27 at 13:41

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