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Custom first layer calibration gcode on damaged sheet  

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Pascal Heitz
(@pascal-heitz)
Active Member
Custom first layer calibration gcode on damaged sheet

Hello there 🙂

Just got my first 3d printer, which is a nice MK3S+.

When doing the first-layer calibration, I've accidentally put the nozzle too low, which damaged the sheet. Now there is forever a grooved damage onto the sheet where the final square zigzag takes place. This groove is making the printed plastic very very sticky. Because of that, at every new first-layer calibration I do, I struggle to remove the zigzag square because it sticks to the damage groove.

I assume the first-layer calibration simply consists in printing a built-in gcode file, which indicates to print this here and that there. Is there a way to change the built-in gcode, so it prints the zigzag square away from the damaged zone.

Of course, there are many other solutions, such as buying a new bed sheet, or printing my own test gcode from the sdcard. But I figured that would be super-neat if I could just modify the built-in gcode.

Is that something I can configure?

Thanks!

This topic was modified 6 months ago by Pascal Heitz
Posted : 13/09/2023 9:40 pm
JimB
 JimB
(@jimb)
Estimable Member
RE: Custom first layer calibration gcode on damaged sheet

The only way to modify the built-in calibration would be to modify the firmware and re-compile it.  I suspect most people here would say to forget about the built-in first layer calibration and use one of the many alternatives that are better.  You can even create your own 1-layer tall 60-75mm square placed wherever you want all within a slicer.  Having something bigger makes it a lot easier to try different Z values during one print.

Oh, and flipping the damaged sheet over is another option you have instead of trying to avoid the groove.  They are almost all double sided.

Posted : 14/09/2023 12:14 pm
Pascal Heitz
(@pascal-heitz)
Active Member
Topic starter answered:
RE: Custom first layer calibration gcode on damaged sheet

Thanks for your reply!

Indeed, @fuchsr's 3mf model was amazing, and let me pick a Z value very accurately. Thanks again!

Posted : 14/09/2023 4:49 pm
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