#XYZ calibration failed. Prusa Mk3s+

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crystal creek
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I need some help. I have a prusa mk3s+. This print is supposed to be in the middle, but it printed in the back. Also, whenever the printing bed goes to the back side, the motor starts going crazy because it hits the end but it just keeps going. I ran the XYZ calibration and it failed after like 7 minutes of running. Please help!

IMG_2965.jpg IMG_2964.jpg
tidal carbonBOT
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errant bough
tidal carbonBOT
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Belt tensioning

To have proper belt operation it needs to be operating under tension according to specification.

Most printers use GT2 belts and this'll be reference point here. For Gates GT2 6mm wide the operating tension is 30±5N.

To achieve that, we use tensioners to pull the belt tight.
To measure belt tension we can use a phone with Spectroid app or other audio spectral analyzer. Then proceed with hte following steps:

  • start the app and zoom in using 2 fingers to show the range from 0 to ~200Hz
  • Put the phone microphone next to the middle of belt section and pluck the belt like a string
  • Observe the peaks showing on the app. The peak with the lowest frequency is the one you're looking for
  • If frequency is too low, pull the belt tighter. You can shorten the belt span (distance between 2 contact points on which you're plucking the belt and measuring frequency) if expected frequency is below 100Hz

To calculate required frequency use
?belt_freq [belt span in m] [belt width in mm if you're using different than 6mm].
This will show the range of frequencies that you should be in.

To check tension based on frequency, use
?belt_tension [frequency in Hz] [belt span in m] [width in mm if other than 6mm]

WARNING: Not all printers are meant to handle the tension like this and due to this belt tension can cause parts to bend or stepper shafts to break. Proceed with caution.

?tensioning requested by: wolfesbluebox
errant bough
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And\or move the bed to the back + nozzle to the right side while off + try re-running it (to sortive reset the position so calibration can work)