You might also say none of you other steppers have problems with TinyG 🙂 I can’t really comment on the motor. It might be sensitive to power levels and/or microsteps. Have you played with them? Also, is the step angle set up properly?
I tried setting microsteps to 1 ad 8. Step angle is correct at 1.8. I tried several power levels. I took off the planetary gear, and the problem is in the motor, not the gearbox. My other motors seem happy with TinyG.
I am trying to remember how to drive a motor right from an arduino, to have better control of each step.
Sure. I bought it from StepperOnline.com. It has a 1:13 planetary gearbox. I bought only one. It is above average in quality compared to my other steppers.