Z Offset

If you are using CARTOGRAPHER_TOUCH_HOME, you shouldn't have to care about your scan offset. Everything that scan is used for, is relative to itself and the Z-offset is a constant that is applied to every measurement. Thus it only has an impact, if you start printing without using CARTOGRAPHER_TOUCH_HOME.

We implement Klipper's Z_OFFSET_APPLY_PROBE , this will apply the offset to the last homed mode used. This means if the last mode you used was G28, it will apply the offset to your scan model. If the last mode you used was CARTOGRAPHER_TOUCH_HOME it will apply to your touch model.

Babystep adjusting Z offset

We recommend you follow Ellis' Print Tuning Guide.

This is easiest to do through Mainsail or Fluidd. These will show a button to adjust your z offset "live", during a print. You must use the save icon that appears next to the adjustment controls AS WELL as a SAVE_CONFIG.

Short version is to run the following macros to adjust gcode while printing a bunch of first layer squares, until you achieve the perfect first layer.

To move up, use SET_GCODE_OFFSET Z_ADJUST=+0.01 MOVE=1

To move down, use SET_GCODE_OFFSET Z_ADJUST=-0.01 MOVE=1

To finalize, use Z_OFFSET_APPLY_PROBE, you can then see what changed

cartographer: touch default z_offset: -0.1

Remember to run SAVE_CONFIG to persist the change to your configuration.

A smaller number means a larger distance between the bed and the nozzle. This can seem counterintuitive, but this is to keep it in line with Klipper's virtual probe, and makes sense from a technical point of view.

The user should never change the number manually in the config, as that can risk causing issues.