Z-level after 6 months of nice printing
Hi hive
Very old and common question - "calibration failed! Check the axis and run again". But in my case it happened 6 months after a good printing. I incidentally moved the printer while it was printing. Then it got stalled and asked to calibrate. Since then I am battling to re-calibrate the Z.
Now it does not matter where the PINDA is 1mm from the heatbed or too high or too lower - it stops on its way from the top at point 1/9 at around 2.5 cm and proclaims the famous "Calibration failed!"
All other self tests are perfect
Any fresh idea, except "take your time to calibrate PINDA", would be greatly appriciated.
Alex
RE: Z-level after 6 months of nice printing
Well, PINDA in the last photo is clearly too high ;), but since you say you tried all various heights ...
... check that the Z axis can move freely by turning the threaded rods simultaneously with your finger and that the Z smooth rods are aligned and that the bearings are not getting stuck (have you evr. If there is too much friction going down, the firmware will give up based on the amount of current needed to turn the Z steppers. It does that to prevent eg. hard bed crashes.
RE: Z-level after 6 months of nice printing
Thanks Vojtech
Sounds interesting, though I believe the rods is an issue as it happened after I had to carry the printer away from the imminent damage and started playing with PINDA once the message of misalignment (or something ) popped up. Plus, the Z calibration passes the top points of alignment before getting stuck at 2.5 cm. Who do you check bearings, I do need to dissemble them, do I? I hope you say no...
Cheers
Alex
RE: Z-level after 6 months of nice printing
You check the Z bearings by unscrewing and removing the vertical steppers. (Without undoing anything else. You will need to cut the cable ties, though, to free the Z stepper cables). Then you check whether the whole X assembly moves freely on the Z rods. It should be silky smooth and move by itself just by tilting it a little and letting gravity pull it.