Quote Originally Posted by Sam0117 View Post
Hi Mr.ben I have infeeling that your stepper motor is faulty or wired wrong? When a stepped motor has its pairs correct the motor won’t turn unless it has a signal to move, so when you power off you shouldn’t have the z axis drop, sorry I can be more helpful but I’m confident you have a problem either with the stepper motor or how it’s been wired up

Hope this helps 👍🏼
This statement is incorrect. When a stepper is not energised it can free wheel and will when the Z is heavy. Some machines have an electric brake on the Z motor for that reason.