Very weird calibration problem

Crono

(@crono)

New Member

Very weird calibration problem

tldr: On my mk3 kit version the z-axis goes up in the right front corner - on xyz (second calibration point) and z calibration (third calibration point) instead of down.

Long version: I relocated my printer - i swapped the table underneath. After that i wanted to do a full xyz calibration. But the calibration fails everytime on the second point.

for xyz calibration i get the "xyz calibration failed. bed calibration point was not found" error

for the z calibration i get the error that the probe didnt trigger and i may clean the nozzle

What i tried:

The printer is in goodcondition, all axis move freely.

Movement in generall also looks good, all axis can be moved in any direction by the motors.

Steelsheet was off during xyz calibration and on during z calibration.

I cleaned both the heatbed and the steel-sheet. Also the nozzle was clean with no debris on it.

I made sure nothing was stuck under the heating-bed (as i thought maybe some metal part interfers with the probe ...).

I also checked manually that the pinda probe triggers - and yes it does, even on the front right corner. As far as i can say it is in perfect working order.

Also i did a self check with perfect results.

I also tried 4 different firmware versions - same result on each so i guess the problem is a hardware one.

I also did a complete factory reset of the printer.

I made a video for illustration:

I also googled this problem, but found absolutely nothing. I have absolutely no idea what to do now. I just have absolutely no clue what could be wrong. The printer did a 14 hour print just perfectly fine a few hours before this incident and generally i am super happy with this model.

I hope someone can give me a tipp on what i could try next.

Greetings, Aelonath

Posted : 20/08/2018 9:28 pm

Peter in Katy

(@peter-in-katy)

Estimable Member

Re: Very weird calibration problem

Flash firmware 3.1.2.

https://shop.prusa3d.com/forum/assembly-and-first-prints-troubleshooting-f62/error-in-xyz-calibration-t23899.html

Posted : 21/08/2018 1:32 am

Punkgeek

(@punkgeek)

Member

Re: Very weird calibration problem

Is your pinda probe possibly a bit too high? (i.e. on the border of detection)

Posted : 21/08/2018 2:58 am

Crono

(@crono)

New Member

Topic starter answered:

Re: Very weird calibration problem

Flash firmware 3.1.2.

https://shop.prusa3d.com/forum/assembly-and-first-prints-troubleshooting-f62/error-in-xyz-calibration-t23899.html

I saw this post, but i didnt felt that the Problem was connected with mine. But I will try 3.2.1 when i come home this evening. By the way i tried the following firmware versions:

3.4.0-RC1

3.3.1

3.3.0

3.2.1

Is your pinda probe possibly a bit too high? (i.e. on the border of detection)

Nope. It also worked perfectly fine all the time. It was about 2-3mm above the nozzle. Now i lowered it to about 0,5-1mm above the nozzle. Same effect. And as i said: the probe does trigger just fine and a good amout above crashing into the bed - so this is not a problem at all.

In case Firmware 3.2.1 fixes this: then this Bug should really be fixed as it may be in all four of the newest firmware versions. But i just cant imagine that ^^

Greetings, Aelonath

Posted : 21/08/2018 8:27 am

Peter in Katy

(@peter-in-katy)

Estimable Member

Re: Very weird calibration problem

Flash firmware 3.1.2

In case Firmware 3.2.1 fixes this: then this Bug should really be fixed as it may be in all four of the newest firmware versions. But i just cant imagine that ^^

Greetings, Aelonath

Support asked the user to flash 3.1.2.
The bug may have been introduced in the 3.2.x branch.

Posted : 21/08/2018 6:20 pm

Frio

(@frio)

Estimable Member

Re: Very weird calibration problem

[*] Steelsheet was off during xyz calibration and on during z calibration.

I had something very similar to this happen over the weekend after doing some work on the Y axis. Try going through the procedures with the steel sheet on and only remove it when asked to. This made the difference for me and it has been fine since.

Do Z calibration first and then XYZ.

Posted : 21/08/2018 6:29 pm

Crono

(@crono)

New Member

Topic starter answered:

Re: Very weird calibration problem

Support asked the user to flash 3.1.2.
The bug may have been introduced in the 3.2.x branch.

Sorry, this was a typo 😀

I had something very similar to this happen over the weekend after doing some work on the Y axis. Try going through the procedures with the steel sheet on and only remove it when asked to. This made the difference for me and it has been fine since.

Do Z calibration first and then XYZ.

I did that, see my discription:

Steelsheet was off during xyz calibration and on during z calibration.

Anyway: Support reached out to me and sent me a link to a page describing how to check the pinda probe the right way. Turns out: if the x-carriage is pushed to the far right side, the firmware gets the signal that the z-endstop is triggered without the led going out. So i have a faulty cable. I can also reproduce this easily by just bedingt the cables comming of the extruder carriage a few centimeters to the left side as they would by moving the carriage. I checked the zip ties, but they where not too tight and also the cables showed no signs of damage or pressure.

I hope i get it replaced 😥 I will keep you updated. But for now: thank you for the input! And maybe this thread will help someone in the future having the same problem.

Posted : 22/08/2018 10:59 am

Crono

(@crono)

New Member

Topic starter answered:

Re: Very weird calibration problem

I got a new pinda-probe - the Printer is working perfectly fine now. Thanks for the good Support @prusa.

In conclusion:

Weird Calibration Problem with all Points on the right side.

pinda was fine (led indicates that the probe is working)

Cable was broken and told the firmware that the z-endstop (= pinda) triggered when it didnd by moving the cable. I found this by following this guide. (Later firmware do not have this option, maybe you have to downgrade or upgrade if prusa decides to add pinda debugging once more into firmware)

Printer works finde with new probe.

Posted : 28/08/2018 8:17 pm