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I'm having an odd effect in my prints. There is some sort of surface problem that seems to be evenly spaced in z. I tried to tighten my belts, the print speed is 75 mm/s using a 32 bit board, on an Ender 3 Pro.

Any recommendations?

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The surface defects you describe is caused by Z-wobble. Basically this leads back in a defect in the Z axis gantry where X and/or Y movements are transferred into the print head. This can be cause by:

  • a damaged nut,
  • lead screw not straight,
  • stick-slip,
  • binding,
  • lead screw out of alignment with the coupler,
  • lead screw touching the stepper shaft in the coupler,
  • the Z guide (at the other side of the X-axis arm; the one without the extruder mounted on it) has too much friction of the wheels on the profile,
  • play on the carriage,
  • lead screw should be the same distance from the extrusion profile from top to bottom,
  • etc.

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  • $\begingroup$ ...and possibly a cummulative rounding error $\endgroup$ – Trish Mar 22 at 14:11
  • $\begingroup$ @Trish Didn't you write a previous answer on that? Please add an answer or link to it. $\endgroup$ – 0scar Mar 22 at 14:13
  • $\begingroup$ It was discussed in 3dprinting.stackexchange.com/questions/10986/… $\endgroup$ – Trish Mar 22 at 14:17

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