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Z calibration fails on central points  

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piero.b
(@piero-b)
New Member
Z calibration fails on central points

Hi, yesterday after a failed print my Mk2S couldn't complete the initial 9 points Z check , and in the central row of the bed the noozle touches the bed. I tried to recalibrate it but I've got an error after the procedure. What is happening? I haven't changed nothing..

Does someone ever had the same problem?

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Posted : 13/07/2019 8:47 am
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(@)
Illustrious Member
RE: Z calibration fails on central points

Debris under the steel sheet?

Posted : 13/07/2019 11:49 pm
piero.b
(@piero-b)
New Member
Topic starter answered:
RE: Z calibration fails on central points

No debris, all clean...

 

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Posted : 14/07/2019 12:52 am
Frans Krau
(@frans-krau)
Trusted Member
RE: Z calibration fails on central points

Your write: I tried to recalibrate it but I've got an error after the procedure. Question: Is the error on the LCD?What text?

Check your cables. Maybe the cable of the PINDA is broken. Move cable and see if the LED of the PINDA goes on and off.

Frans

Frans Krau
Europe, Holland, Apeldoorn...
Posted : 21/07/2019 8:55 pm
BillC
(@billc)
Reputable Member
RE: Z calibration fails on central points

Have you tried just switching off and letting it sit for ten minutes and then powering up again? Sometimes it just needs a restart after a failure to get everything back to normal.

 

Bill
Tagaytay City, Philippines
Founder member of Philippines Prusa Printer Owners FB Group
Sponsor Pillars of God Academy in Bacoor...
Posted : 22/07/2019 3:47 pm
piero.b
(@piero-b)
New Member
Topic starter answered:
RE: Z calibration fails on central points

The error on the LCD is to check if there is debris on the noozle, and the calibration fails.

I checked the PINDA sensor, the led is ok when I'm near the sensor with a cutter.

Is it possible that the bed suddenly fails in giving the correct contact to the sensor only in the middle zone? 

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Posted : 23/07/2019 4:24 pm
PJR
 PJR
(@pjr)
Moderator
RE: Z calibration fails on central points

Check you Y axis drive pulley; there may be a string of plastic wrapped around it causing incorrect Y movement.

Also, ensure that there is a small gap between the pulley and motor body; any binding will also do the same.

Check the belt tightness and ensure the bed moves well in Y direction.

If all is OK, then check the PINDA.  Raise Z to about half-way. Go to the sensor status on the LCD and move the extruder left and right; trigger the PINDA at different positions using a screwdriver and check both the PINDA LED and the LCD PINDA status to ensure they are both in the correct state.  Your problem will probably be PINDA cable, when the extruder is close to the right hand edge of the bed.

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…...
Posted : 24/07/2019 7:55 am
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