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Unlikely that it’s the stepper. It sounds like something’s scraping. I heard similar noises after inconsistent extrusion on infill, so that the infill was standing up a little bit and the print head was scraping over it.

Could also be ball bearings or something else in there that’s scraping over something. It is most likely something connected to the motion.

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Natanox@discuss.tchncs.de ⁨1⁩ ⁨week⁩ ago
I’ve checked the print it was working on and changed the Z-offset, had no influence on these scraping sounds. It’s definitely somehow connected to the extrusion, that’s why I assumed it to be the stepper.

Do you think those really tiny bearings used for the extruder axis’ can make such a sound? Other than that I’m really out of ideas outside basically sanding down anything that could be the problem… I even made sure to print the whole MK4 extruder you see in the video on the Prusa MK4S of my local hackspace to make sure it has perfect dimensional correctness etc.

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- marcos@lemmy.world ⁨1⁩ ⁨week⁩ ago
  
  Do you think those really tiny bearings used for the extruder axis’ can make such a sound?
  
  Absolutely, yes. If it never made that sound and started with age, do not go sanding anything. Clean and lubricate again and look for broken parts.
  
  Any point of contact can be making that noise. Including the motor, yes, but everything else is more likely.
  
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  - Natanox@discuss.tchncs.de ⁨5⁩ ⁨days⁩ ago
    It was, in fact, one of those tiny bearings.
    
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- squaresinger@lemmy.world ⁨1⁩ ⁨week⁩ ago
  In the middle of the print change the flow modifier to 0%.
  
  That will turn off the extruder while leaving everything else as-is.
  
  I suspect it’s the X or Z bearings.
  
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