Reply To: Z axis sticks, plunges deep into material

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I had problems early on with the printed rigid coupler not holding onto the stepper tightly enough. It slipped a lot. I replaced it almost immediately with an actual metal one. You can check yours by watching the stepper motor at the point when the tool is supposed to retract. If the stepper turns but the allthread does not, there’s a problem. The allthread should turn with the stepper at all times with no play at all.