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Y calibration fails but printing looks fine  

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Helmi
(@helmi)
Active Member
Y calibration fails but printing looks fine

Hey forums,

I’ve built a MK4 kit yesterday and things went quite smoothly except the Y calibration fails.

I’ve double checked alignment, belt tension and all the stuff. Bed moves freely and smoothly by hand and by motors. I’ve also tensioned the Y bearing holders just as far before they start getting a bit louder and have noticeable friction.

When the printer does XYZ-Calibration it does Z and X quite fine, then moves the bed all the way back, where things still seem to work, As soon as it moves the bed forward it moves 211mm according to display and then bumps into the Y idler mount and fails. 

I did do a print which went very well and looks awesome, I just started a second one which also looks good. So printing seems to be fine. I’m a bit out of ideas why the calibration might fail. Does anyone know the factors that could lead to the calibration failing? What is the software expecting at this point that it doesn’t get?

Any help is appreciated.

Thanks,

Helmi

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Posted : 25/11/2023 8:06 am
René
(@rene-3)
Reputable Member
RE: Y calibration fails but printing looks fine

Here you can find some solutions to your problem.

 

Posted : 25/11/2023 9:05 am
fastbike
(@fastbike)
Member
RE: Y calibration fails but printing looks fine

I had some issues with the Y axis after assembling my kit. When I carefully examined it when the calibration failed I realised the bearings had not seated correctly, so some realignment fixed all of the issues. Take another look and double check against the instructions.

Posted : 25/11/2023 9:26 am
Zappes
(@zappes)
Estimable Member
RE: Y calibration fails but printing looks fine

Today I performed a factory reset because the 5.1.0 firmware kept crashing and crashing. After the reset, the calibration wizard started and now my Y axis keeps failing to calibrate. The printer works just fine, prints are OK, everything hunkydory - just the damn self test fails and I see no reason.

I even got the beast out of the enclosure and checked the bearings - those seem to be in the right places as well. Belt tension is fine, too. I have no idea what I could try now.

My models on Printables
Posted : 26/11/2023 4:58 pm
Zappes
(@zappes)
Estimable Member
RE: Y calibration fails but printing looks fine

Well, as a desperate measure, I downgraded the firmware to 5.0.0. Self-test passed without any issues, printer prints and I won‘t touch the 5.1 again with a 10 foot pole.

I bought a factory-assembled Prusa because of the legendary reliability the brand is known for, but the 5.1 firmware is such an epic dumpster fire of shittyness that I really start to question my decision.

My models on Printables
Posted : 26/11/2023 5:26 pm
Tyler Dola
(@tyler-dola)
Active Member
RE: Y calibration fails but printing looks fine

I have the same issue... My fan was failing on firmware 5.0.1, so they upgraded me to 5.1.0 beta and then final.. My fan passed, but now my Y fails when it passed before!

I've taken it apart already and re-did all the  Y bearings... I was on with support all day Friday sending videos and pictures... nothing.

My problem though is that it does not print fine. With input shaping on, it prints crap as each layer has X-shifting.

I'll try a rebuild again, but maybe I should factory reset as well and downgrade... I had a way to make my fan pass by holding it horizontally.

Posted : 26/11/2023 6:42 pm
Tyler Dola
(@tyler-dola)
Active Member
RE: Y calibration fails but printing looks fine

Update: My layers kept shifting because my X motor pulley was not pushed in enough. I loosened my grub screws, pushed it in so that the belt is not rubbing against the motor holder, and voila! Beautiful prints now with input shaping.

Posted : 27/11/2023 4:10 am
brescoli
(@brescoli)
Member
RE: Y calibration fails but printing looks fine

I had the same problem that the Y axis test was systematically failing, independently of the belt tension or the positioning of the bearings. I had trouble shoot the problem and the root cause was that I had installed wrongly the Y-Belt tensioners (step 29) of the Y-Axes assembly instructions. I had installed the one that goes left in the right position and the left one in the right position. I had re-installed the Y-belt tensioners in the right position and the problem of Y axis fail is solved. Now it always passes the test.

Posted : 03/12/2023 12:14 pm
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