Stepper motors overheating

Depends. If @hitman47 calibrated his e-steps with the gear ratio then he cannot

More generally:

  • It is recommended not to use hold_current → Not used by @hitman47 == good
  • Not using hold_current means that as soon as the steppers are powered, they are powered with full run_current
  • Nothing obviously wrong with the settings. On the contrary, a run_current of 0.6 seems quite conservative
  • According to my experience, how steppers are behaving strongly depends on the quality of the steppers. I had some that would exhibit this aggravating high-pitched hum as soon as powered and also got very hot. Never experienced the same with Moons or LDO steppers.
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