0.0000390625mm per step at 25600 steps per mm. That kind of resolution is eaten up by slop in the mechanics and even the motor +- accuracy. It's really not helping anything.
the only time you might want to increase microstepping is on an axis that has very low steps per mm naturally. Like maybe an ungeared direct extruder.
for the Z axis as long as you're able to hit your layer heights as a even multiple of the full step size you can't get much better.
You can learn more about stepper motors here:
https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors
@aprz said in Odd z axis issue with prints:
Also, even with a 0.9 degree motor the advantage of using higher micro stepping isn't worth it? i know that when you increase the micro stepping you decrease torque and the 0.9 motor already has less torque than a 1.8. So you would need a higher current to increase torque and that would solve the issue of lost torque?
This isn't quite right. The torque generated in stepper motors comes from the angle difference between where the motor is commanded and where the shaft lags behind. The larger the difference the larger the torque. A 0.9 motor has less torque per step, but there are twice as many steps. The amount of torque at the same position is the same as a 1.8 motor. 1 step of a 1.8 motor is the same as 2 steps of a 0.9 motor.
