Z axis calibration failing immediately after use paper dialogue

During calibration, specifically any Z calibration, the printer will fail immediately after clicking continue when prompted to use a sheet of paper for the first 4 points, I.E the first click after the word "immediately" it proceeds to almost ironically immediately error (see fig 1). This prevents further calibration, and subsequently printing. All figures were taken immediately after a failure, to give the most true representation possible.

At this time the following figures show the state of the printer after failing. The most concerning being Fig 2, which shows that while at the top left most position the pinda probe is returning a signal of 1, wheras I believe the probe should be returning 0. This will be the next place I investigate for issues, checking pinda connections and that its not on too tightly.


  • Original Prusa i3 Mk3 (Kit)
  • Firmware update OS: Windows
  • Shipped firmware: 3.1.1 RC5 150
  • Current firmware: 3.1.1 RC5 150 (re-flashed)
  • Gummy bears: Eaten

Attempted fixes:

  • RTFM
  • Re-flashing latest firmware that it was shipped with (using windows) version 3.1.1-RC5-150 to version 3.1.1-RC5-150
  • "Reset XYZ calibr." + Wizard
  • "Reset XYZ calibr." + Calibrate XYZ
  • "Reset XYZ calibr." + "Calibrate Z"
  • starting the three versions of calibration above with varying [x, y, z] starting positions (I.E extruder assembly starting at different positions)
  • checking solutions proposed for similar problems. Calibration Failure! error mssg on Z & XYZ calibration

Next steps while waiting for suggestions:

Error Msg (Fig 1):

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State after attempted z calibration (Fig 2):

Although hard to see this says;

  • X1
  • Y1
  • Z1 <- unexpected value

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Self test ok (Fig 3):

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Z manual move (move axis) after calibration (Fig 4):

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Top-right endpoint (Fig 5):

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Top-left endpoint (Fig 6):

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Side angle of pinda probe and nozzle height (Fig 7):

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apologies for the size, this is both a request for help and a self articulation to better tackle the problem.

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I'm seeing a similar problem - with mine, one of the leadscrew caps (the little black ones with the four screw holes) is quite tight. With the Z-axis set removed, I can fairly easily flick ones of the black caps and it will spin and move up and down the screw - but the other one is very stiff and requires me to hold the screw in order to move the cap. Are you seeing a similar issue?


I did have one of my screw caps be tighter than the other, but I don't believe this should be an issue unless they are pressed hard against the motor, as they should just spin in place, hovering lightly above the motor. Assuming there aren't high friction forces from the aforementioned pressed-against-motor case.


Actually let me clarify in your other recent post you speak of the black trapezoid nut whereas here you speak about black the lead-screw cap. The former could have a direct latter, but the former (i believe) is as stated above.


im lead to believe that the self test, does not check the pinda probe, and this could be the root of the problem during z calibration, if say the probe had a loose connection which wasn't diagnosed in self test. If this is the case then maybe an error message change to indicate whether this is the change or not.


!!! my suspicions were correct, I found the pinda probe connector loose/ disconnected. It works.


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If you get a failure immediately after paper prompt in some form of Z calibration, then it is likely your pinda probe. Solved my problem by finding a loose pinda probe connection, and reconnecting it. Don't make my mistake, good luck and happy printing!

Pinda probe connector=7 here

A note to any prusa folks, I believe this error message is quite vague. Since the issue with pinda probe is detectable, could an error message be added for this specific case, since the pinda probe is not detected at any point prior to this stage, anyone who has a loose connection could misdiagnose this as an issue with the pinda probe itself. Maybe something like:

"Pinda probe could not be detected, please check your probe connection to einsy."

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