How does Z-offset get calculated?

General Discussion
1

Basic Information:

Printer Model: Ender 3
MCU / Printerboard: SKR Mini E3 V2.0
klippy.log (1.2 MB)
klippy.log

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Describe your issue:

Just curious how the Z-Offset works. I started with a Z-Offset of 1.520 then using the Mainsail Z-offset tuning I dropped the nozzle to the bed by another 0.100 mm and saved, now the printer.cfg shows Z-Offset of 1.620? And when I print the 1st layers is worse than last time?

Robert

2

Actually quite simple:

  • The Z-Offset is the amount Klipper needs to correct in order to compensate for the distance between probe tip and nozzle towards the bed
  • Basically the amount Klipper needs to move the nozzle down to the bed
  • As a consequence the bigger your Z-Offset is, the closer the nozzle is moved to the bed
3

Thanks so much for the quick response!

That seems counter intuitive. I also assumed it was the distance between the point the ABL probe retracts and the nozzle, so the greater the number the further the nozzle is from the bed.

But I also found out what my overall issue is. And that is in my start gcode I was asking Klipper to perform a Bed_Mesh_Calibrate but not loading it in after it was finished.

Going to run some more tests and see if its fixed.

Robert

4

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