It gets pretty hot, and the failure seems to happen hot.That shouldn't kill the Z motor.
Is the motor running hot or anything?
Conductive screwdriver is fine provided it's got a plastic handle, or you use a small plastic bag or whatever over a metal screwdriver handle so you don't short the pot to your body.oh shit.
How do I adjust it if that's the case? Do I need a screwdriver that's non-conductive?
Should I measure the voltage of the X or Y VREF pots, or is there a specific voltage that I should be looking for?Conductive screwdriver is fine provided it's got a plastic handle, or you use a small plastic bag or whatever over a metal screwdriver handle so you don't short the pot to your body.
A4988 Drivers Vref set to ~90% of stepper rated current Rs = 0.1ohm X = 0,58v (0,725A) Y = 0,58v (0,725A) Z = 0,58v (0,725A) E = 0,72v (0,900A)
I adjusted it down to .5V. All of the Vrefs were pretty on the money. I also turned the Z rod over, in case there was some schmutz binding it up. It's printing now, we'll see what happens. Since I can't print on glass on account of the new one is in the mail, not on the machine, I'm printing on blue painters tape, 'cuz I don't want to tear chunks out of the buildtac.Just measure the voltage, yeah.
Z doesn't need to be set as high because it's not accelerating things fast and has 4x the mechanical advantage with the leadscrew, dial it back to 0.50V if it's running hot.