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Z crash after flipping spring steel sheet  

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MeghansUncle2
(@meghansuncle2)
Member
Z crash after flipping spring steel sheet

I bumped the super pinda on my MK3S+ after a print and the next print attempt put a nice groove in the stock build plate so I bought this one: https://www.amazon.com/gp/product/B0C9MGCG19

I put the new one on (powder coat side up) and recalibrated and all was well until I decided to try the other side.  I flipped the sheet to the textured PET side and tried a print and the print head is now touching the sheet and crashing on initial cal.  Am I doing something wrong?  Do I need to recalibrate from the start when flipping this sheet, or is it something else?  And if I need to recalibrate for each sheet are the sheet cals storable so i don't have to recal every time i change sheets?  Thanks.

 

Best Answer by Neophyl:

The 2 different coating have different thicknesses.  The PINDA is detecting the steel of the sheet.  The calibration for z is to take the difference between the actual print surface and the steel detection point into account. 

You need to calibrate for the different sides separately and store those as 2 different values.  Just as if you had 2 different sheets, as that in effect is what you have.

If you are using a newer firmware then there are several 'slots' to store different values for sheets.  If not just write it on the sheet edge with a marker.

Posted : 15/04/2024 12:05 pm
Neophyl
(@neophyl)
Illustrious Member
RE:

The 2 different coating have different thicknesses.  The PINDA is detecting the steel of the sheet.  The calibration for z is to take the difference between the actual print surface and the steel detection point into account. 

You need to calibrate for the different sides separately and store those as 2 different values.  Just as if you had 2 different sheets, as that in effect is what you have.

If you are using a newer firmware then there are several 'slots' to store different values for sheets.  If not just write it on the sheet edge with a marker.

Posted : 15/04/2024 2:42 pm
MeghansUncle2
(@meghansuncle2)
Member
Topic starter answered:
RE: Z crash after flipping spring steel sheet

Thanks, that makes sense.  I am running the latest firmware so I'll look for the "slots" to save and then recal the 2nd side.

Posted : 15/04/2024 5:45 pm
MeghansUncle2
(@meghansuncle2)
Member
Topic starter answered:
RE: Z crash after flipping spring steel sheet

Neophyl, Thanks that did it. It also gave me a better understanding of the relationship between the sensor and the spring steel plate.

Posted : 16/04/2024 3:02 am
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