# Homes if not homed, skips homing if already homed.
[gcode_macro COND_G28]
gcode:
  {% if "xyz" not in printer.toolhead.homed_axes %}
    RESPOND PREFIX="PRINT_START: " MSG="Homing all axes"
    LEDS_STATUS_HOMING                                    # Set LEDs to homing-mode
    G28                                                   # Do the actual homing 
  {% endif %}