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!
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.
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!