Updated Firmware - Can No Longer Calibrate Z
Last summer/fall I bought a Prusa-assembled MK3. I put about 80 hours of printing on it and the results were good but I heard amazing things about the 7x7 bed leveling, so I updated the firmware to 3.7 as soon as it was available.
After flashing the firmware onto the printer, I could not longer calibrate. It failed with the paper test on the Z axis. The hot end would punch through the paper and I would immediately power down, as instructed. I could not figure out how to the solve the problem and eventually loaded the 3.6 firmware. Same problem.
I just loaded the 3.71 firmware. Same problem. The errors I get are:
"Calibration failed! Check the axes and run again."
"XYZ calibratin failed. Bed calibration point was not found"
I have absolutely no clue what to do. From what I've read, it may be a problem with the PINDA but I can't figure out how to test for that problem. I see other people complain of similar issues and they say they lowered their PINDA but I can't figure out if I should do that or how I would do it.
I've been dead in the water for months and would greatly appreciate any specific help with links for how to do whatever it is that I need to do. Many, many thanks in advance!!!
RE: Updated Firmware - Can No Longer Calibrate Z
I have done the calibration three or four times in the last 48hr due to:
- Dismount of the E-Extruder
- Nozzle change
even if the manual is a little obscure about this crucial phase I learn the following:
At big bang (the very first moment in which you start the process), you should have the a paper sheet over the bed (without magnetic plate) and the nozzle should be in the center of the bed over the paper, so near that you can feel a very very light contact.
No parts in the manual explains how to do this; I assume you will have to go down manually with the head (with the printer turned off) screwing the Z-axes, and moving X and Y to center it. Move the X and Y to ensure the nozzle do not hit the bed. In case of hit, just raise the nozzle a little moving manually the Z axes.
Then in case you have ever dismounted the nozzle, or to ensure the PINDA did not lost its calibration, it is advisable you check/regulate the PINDA sensor distance from the plate. That is very easy: you need one of the black cable ties (same model used in the Prusa, since its height is taken as referral). Unscrew the PINDA screw, and just after the Big Bang, remove the paper, put the tie under the PINDA, and ensure the PINDA is exactly in contact with it, and the screw the PINDA screw.
Then turn on the printer, and perform a CALIBRATION WIZARD, clearing all memory (always a good thing after firmware upgrade).
All should go fine, since the PINDA is at the correct distance, the nozzle either, and it will performs also all the diagnostic tests.
All should go fine.
Regards
RE: Updated Firmware - Can No Longer Calibrate Z
Left on bed and wright on the bed, you should adjust the z by hand(in the manual), then the nozzle does not crash in the bed.
Then move to the middle, to check if it hits the bed.
The paper is for you to detect crashing in the bed, and that you can pull the power, that is why keep holding the paper and move it a little bit all the time, then you feel it go wrong, if it happens.
XYZ failing.
try the pinda sensor higher and lower a little bit.
Or try resetting the printer, so it looses all data, and start fresh, search forum or google how to.
Also move the z axis to the top, and start XYZ could help, the z axis needs to hit the top, several times.