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Hold on there. I wrote that I MAY have been able to use a lower torque motor. I could well be wrong, I've not tried it and I've not done the measurements and calculations to see what roughly is required. So, if you simply try some other motor be prepared that it may not work. If I were going to simply try a lower torque motor, I'd perhaps try one of the stepper motors used for the extruders. That way, if it doesn't work for the Z axis, I still have a use for the motor (extruder axis).