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The model of the test part is perfectly smooth and exported/sliced in very high resolution, yet there are slight waves on both axis. These waves are not visible in simulation. Converting to arcs via Arc-Welder does not change anything. No stuttering due to the high resolution of G-code (as it's a 32-bit board).

As there are no stops, and speed is uniform - I expect no ringing. What could be the cause?

Ghost4 printer, SKR-PRO board with Marlin bugfix-2.0.x.

Example print

Greenonline
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BarsMonster
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1 Answers1

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This looks like an issue which repeats EXACTLY layer after layer. I already explained how to solve it in https://3dprinting.stackexchange.com/a/18835/2338 but I answer it again, limiting to this case.

Waves which are exactly aligned vertically, and everywhere, not only after changes of direction, like in

enter image description here

are NOT ringing or "ghosting", they are rather caused by

  • too tight belt (almost always!)
  • poor quality belt
  • poor bearings or idlers (not common)

I also had the issue and it was the belt, too tight. Loosen it, since it can be much looser than you think!

Check How to fix evenly spaced vertical print pattern to get more information.

FarO
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  • From my reading it also looks like it might be stepper motor non-uniform steps / resonances. – BarsMonster Feb 03 '22 at 08:34
  • @BarsMonster it's highly unlikely, if you try to calculate how much such non-uniformities can impact a print. Like 1/8 of a step (12% is already big, it is in fact less than that) would translate in 25 microns for a 20T pulley, and would repeat with 40 mm periodicity. If it repeats with about 2 mm period, it's likely belt related. Have you tried loosening the belt? – FarO Feb 03 '22 at 09:31