My 3D printer was working perfectly, but one day I put it inside an acrylic box and put it to work, that was not a good idea, because the Z axis grabbed the box, after that, the Z axis started to rotate strange, I even tried to change the wires between the motors and the drivers, but it didn't work.

enter image description here

I have a suspicion that the drive must have a safety criterion, so when something strange happens it stops sending the necessary current for the stepper to run, if it is possible. Does someone have any tips on how to make it work correctly again? Remembering that the motor that is working in a strange way is the motor on the right side of the Z axis, the motor on the left side looks normal. Below I will leave a video showing how the printer is working, like, if it moves just a little bit with the Z axis, it looks like it works normally, but if I move it a little more, then it starts to get weird.

On this printer, I used a AtMega Arduino, with RAMPS 1.4 shield, with A4988 drivers, "NEMA 17" steppers and and I'm using the Repetier-host program to control the printer.


  • $\begingroup$ Is it possible that your right Z-Axis motor is now out of sync with the one on the left? Not sure what you mean "because the z axis grabbed the box" I assume somehow it got hung up or hit the box. When I added my second Z-Axis to my CR-10 it behaved similar to yours as it was not in sync with the opposite side stepper. Once I had successfully aligned/ sync'd both steppers it was fine. $\endgroup$
    – apesa
    Commented Sep 23, 2020 at 19:36

1 Answer 1


I've had this happen before on various Prusa i3 style printers, especially with my homemade tight self printed POM linear bearings for the Z linear shaft. The problem is that the right side Z axis has some sort of friction caused by a skew frame, probably caused by the incident you had earlier.

You need to check whether the X axis carriage goes up and down smoothly. Unscrew the lead screw couplers or the trapezoid nuts and check the movement. If it catches friction, try solve where it comes from. The friction is causing the stepper to skip steps and causes the unsynchronized up/down movement. Please check if the frame or the rods have not bent, the distance between the linear guide rails needs to be the same over the complete height.

  • $\begingroup$ Do you mean that I must unscrew the z axis and try to move the x axis manually to check the friction? $\endgroup$ Commented Sep 23, 2020 at 22:39
  • $\begingroup$ @RodrigoFranco Yes, it looks like the frame or rods are bent or some sort of binding occurs. $\endgroup$
    – 0scar
    Commented Sep 24, 2020 at 5:37

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