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Axis Length Error - Axis X  

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Lungo
(@lungo)
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Axis Length Error - Axis X

I am running a Prusa i3 Mk3S+ I built from a kit in 2021.  I have not had any issues with the printer and have produced quality prints.  I had to take the printer down for about 6 months while we were remodeling the room it was set up in.  When I went to get it set back up, I decided to install the MMU2S I bought when I originally purchased the kit, but just never got around to installing.  While I was installing the MMU2s, I also replaced the Extruder motor plate and extruder body because I saw there was some warping around the hot end.  I purchased these parts directly from Prusa.  Now when I try to calibrate it, I keep getting the “Axis Length X” error.  Here is what I have tried so far, in no order:

  • Flashed an older firmware (I am currently running 3.14.1, but have tried 3.9.0 & 3.12.1)
  • Removed all the zip ties on the umbilical and put them back on paying close attention to the orientation.
  • Removed and retightened the cord wrap.
  • Loosened the screws on the back side of the extruder.
  • Taken the extruder apart to make sure everything was tightened from the part replacement.
  • Watched the test from the front, back, side & top to ensure no parts touch throughout the movement of the X Axis.
  • Relubricated the X Axis shafts.
  • Verified the X axis motor is gripping the drive belt, and the belt is not rubbing on either side.
  • I currently have the MMU2S shut off in the settings and have the filament guide taken off the extruder, so this should not be inhibiting movement at all.
  • I can move the X Axis motor from one end of the shaft to the other using the move axis setting.

I think I have done everything I can find online, short of replacing the drive belt.  It seems like every post about the Axis Length error has 10+ solutions that have worked for some but not all.  Does anybody have any ideas on what else I can try?  It has been 2 weeks of me banging my head against the wall with no improvements

Posted : 01/03/2026 3:43 pm
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