[FR] Home Offset Here for a specific Axis

[Elias-Ta]

Is your feature request related to a problem? Please describe.

No response

Are you looking for hardware support?

No response

Describe the feature you want

I need to set Homing offset for a single axis in the current position, this can be usefull in cnc mode if I want to set the zero position for Z_axis based on thikness of the work area (usualy I use the milling head to make the work area or the bed flat)

Additional context

In M206_M428.cpp I changed the function void GcodeSuite::M428() to make it as following, and I think it's working as I need, now by sending G428 Z the machine will set homing offset at the current position only for Z axis.
Maybe this feature can be added to the original code as well if others need it.

void GcodeSuite::M428() {
  if (homing_needed_error()) return;

  xyz_float_t diff;
  LOOP_NUM_AXES(i) {
    if (parser.seen_test(AXIS_CHAR(i))){
      diff[i] = base_home_pos((AxisEnum)i) - current_position[i];
      if (!WITHIN(diff[i], -20, 20) && home_dir((AxisEnum)i) > 0)
        diff[i] = -current_position[i];
      if (!WITHIN(diff[i], -20, 20)) {
        SERIAL_ERROR_MSG(STR_ERR_M428_TOO_FAR);
        LCD_ALERTMESSAGE(MSG_ERR_M428_TOO_FAR);
        ERR_BUZZ();
        return;
      }
    }
    else {diff[i] = 0;}
    
  }

  LOOP_NUM_AXES(i) set_home_offset((AxisEnum)i, diff[i]);
  report_current_position();
  LCD_MESSAGE(MSG_HOME_OFFSETS_APPLIED);
  OKAY_BUZZ();
}

[thisiskeithb]

Maybe this feature can be added to the original code as well if others need it.

It would be useful if you could submit a Pull Request so it could be reviewed.

[Elias-Ta]

Alright, I made a pull request #27015