Calibration with a steel plate and a magnetic sheet
 
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jlc
 jlc
(@jlc-2)
Active Member
Calibration with a steel plate and a magnetic sheet

Hello, I wanted to upgrade my MK2s by buying on ali express a flexible steel plate and a magnetic sheet (energic 3d). Has anyone used this material before? The problem is that I can no longer calibrate my MK2s. Calibration ends in error. I tried without the steel plate and only with the magnetic sheet. But without success. I was wondering if the magnetic sheet did not disturb the PIUNDA induction probe. If anyone has an opinion on it, I'm all ears. Thank you in advance for your comments. Regards, JLuc

Posted : 16/03/2022 7:52 pm
JoanTabb
(@joantabb)
Moderator
RE: Calibration with a steel plate and a magnetic sheet

The Magnetic Sheet WILL disturb the XYZ calibration process!

The Pinda is looking for tiny copper pads in the surface of the heatbed, the magnets will mask the effect of the copper pads. 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 16/03/2022 10:38 pm
JoanTabb
(@joantabb)
Moderator
RE: Calibration with a steel plate and a magnetic sheet

The Magnetic Sheet WILL disturb the XYZ calibration process!

The Pinda is looking for tiny copper pads in the surface of the heatbed, the magnets will mask the effect of the copper pads. 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 16/03/2022 10:39 pm
jlc
 jlc
(@jlc-2)
Active Member
Topic starter answered:
RE: Calibration with a steel plate and a magnetic sheet

Hello Joan,

Thank you for your answer. I have moved on since. Indeed the magnetic sheet disturbed the induction probe. I removed it and the calibration was done correctly. However, we had to find another solution to hold my flexible steel plate. So I put neodymium magnets under my heatbed and away from the copper pads on the surface of the heatbed. It works. However I wanted to know how I should go about calibrating my Prusa MK2s printer with a steel sheet that is 0.7 mm thick. I have to calibrate without the sheet is added in Z the thickness of the sheet? I admit to being a bit lost. Do you have a solution.

Thank you in advance. Sincerely, JLuc

Posted : 02/04/2022 11:02 am
JoanTabb
(@joantabb)
Moderator
RE: Calibration with a steel plate and a magnetic sheet

Hi Jluc, 
there are two separate calibrations. 
XYZ calibration is done with the plain Heatbed and relies on the copper pads, 
Live Z Calibration is done with the build plate installed above the heatbed. and should not need offsets. 
regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 02/04/2022 6:49 pm
AnnieR
(@annier)
Estimable Member
RE: Calibration with a steel plate and a magnetic sheet

I sometimes use a ferrotype plate instead of the Prusa sheet and it calibrates just fine. 

Posted : 03/04/2022 4:34 pm
jella_joe
(@jella_joe)
Active Member
RE: Calibration with a steel plate and a magnetic sheet

Where did you get the plate??

Posted : 20/09/2022 9:59 am
AnnieR
(@annier)
Estimable Member
RE: Calibration with a steel plate and a magnetic sheet

 

Posted by: @jella_joe

Where did you get the plate??

It's a photographer's ferrotype plate for doing wet darkroom prints. I  got it from a guy in our photo club who doesn't do wet printing anymore. 

Fits right on the magnetic Prusa bed. Gives a real good shiny surface to the prints. Now you gotta be sure to recalibrate to use it and hairspray to be sure it sticks. 

Posted : 24/09/2022 4:18 pm
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