Cura: set z-offset
I'm having a Prusa i3 derivative printer with a capacitive sensor for the z-axis. It switches a tiny bit before the nozzle hits the print bed and hence needs a z-offset to be configured.
In Slic3r I have configured the z-offset to
-0.1on the General page of the Printer Settings, but currently I'm evaluating Cura and can't find such a setting. Slic3r seems to apply this setting directly to the generated z-values in the g-code, so it does not use a short version at the beginning of the g-code. My current (except of the auto-bed-leveling part default) g-code:G28 ;Home
G29 ; auto-bed-leveling
G1 Z15.0 F6000 ;Move the platform down 15mm
G92 E0
G1 F200 E3
G92 E0Is there a way to configure Cura, e.g. using the Start Gcode options, to apply the z-offset?
You can trick the printer into applying an offset using the
G92command:G0 Z0
G92 Z0.1First, we move the nozzle to
Z=0. Next, through theG92command, we tell the printer to, from now on, treat the current position asZ=0.1. This effectively applies an offset of-0.1to the Z-axis, since if we now executedG0 Z0again, the nozzle would move down0.1mm.Note that this needs to be done after homing and leveling to be effective.
Of course, you don't necessarily need to move the nozzle to
Z=0for this to work. You could also just insertG92 Z15.1afterG0 Z15to get the same effect.Should I add the line `G92 Z15.1` after the `G1 Z15.0 F6000` line (you write about G0 while G1 is there)?
Yes. `G0` and `G1` are the same thing. Formally, `G0` denotes a rapid move and `G1` a coordinated move, but Marlin doesn't make this distinction. It's just "move".
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Content dated before 7/24/2021 11:53 AM
Thomas S. 5 years ago
Should I add the line `G92 Z15.1` after the `G1 Z15.0 F6000` line (you write about G0 while G1 is there)?