First Layer Calibration Not Working (Got a hole on the steel plane!)
 
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First Layer Calibration Not Working (Got a hole on the steel plane!)  

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coucou
(@coucou)
New Member
First Layer Calibration Not Working (Got a hole on the steel plane!)

All other calibration options work fine

Initially got really weird action and the nozzle was stuck on the right top corner literally hammering down the plane and unable to move (scary!)

Finally got unstuck after changing the nozzle z-offset as far as possible (there is a hole where it was hammering down ... )

But now the max proximity it can go is 0.000.

It can go to the neg side, but not positive. Problem is that now it's too high, so the first layer is very problematic...

not sure if one of the sensors got wonky (though all the other tests work ok)

Furthermore, even if I try to change the z-offset manually (in the calibration 'tab'), can only go to the minus direction...

Prior the calibration it was printing ok-ish (first layer was kind of squashed), so felt it could do better. But since I did the calibration the condition is much worse...

Any help appreciated

(yes turning it off and on, did help, but only so much...)

Thanks

Best Answer by fuchsr:

First of all, the Live Z offset for first layer is ALWAYS negative. The more negative, the closer the nozzle is to the print bed. You can't go into the positive range, because then the PINDA would be lower than the nozzle, which is obviously Not A Good Thing.

To get a good starting point for first layer calibration, make sure the SuperPINDA is at the right height above the nozzle, about 1.5mm. I don't know why Prusa is still recommending credit cards or zip ties, which can vary widely in width. I created this small tool to help find the right position: https://www.prusaprinters.org/prints/57192. That should get you to about -1.o as a starting point (even though the absolute values are meaningless), with wiggle room up and downwards. If you get close to -2.0 you should move your PINDA higher. 

For an illustration of relationship of distance of PINDA to nozzle and sheet, see

 

Posted : 23/09/2021 6:37 pm
fuchsr
(@fuchsr)
Noble Member

First of all, the Live Z offset for first layer is ALWAYS negative. The more negative, the closer the nozzle is to the print bed. You can't go into the positive range, because then the PINDA would be lower than the nozzle, which is obviously Not A Good Thing.

To get a good starting point for first layer calibration, make sure the SuperPINDA is at the right height above the nozzle, about 1.5mm. I don't know why Prusa is still recommending credit cards or zip ties, which can vary widely in width. I created this small tool to help find the right position: https://www.prusaprinters.org/prints/57192. That should get you to about -1.o as a starting point (even though the absolute values are meaningless), with wiggle room up and downwards. If you get close to -2.0 you should move your PINDA higher. 

For an illustration of relationship of distance of PINDA to nozzle and sheet, see

 

Posted : 23/09/2021 7:19 pm
coucou liked
coucou
(@coucou)
New Member
Topic starter answered:
Thanks!

Thank you! Took a small break from printing and kind of forgot the basics hehe

Also thanks for the height adjustment tool, very useful 🙂

Posted : 24/09/2021 5:53 pm
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