Start sequence to heat only needed beds

[Galloant]

Taken from this post https://klipper.discourse.group/t/start-sequence-with-kamp-for-elegoo-os-giga/20008/18?u=gallo
Massive thanks to theophile over on the Klipper forum for the help with this!

I haven't been able to test it due to the Elegoo setup, but now with a proper Klipper firmware on my printer, I will test it as soon as possible.

printer.cfg

[gcode_macro SET_BED_HEATERS]
variable_zone_0_active:0
variable_zone_1_active:0
variable_zone_2_active:0
variable_zone_3_active:0
gcode:
    {% set BED_TEMP = params.BED_TEMP|default(0)|float %}
    {% set zones = [zone_0_active, zone_1_active, zone_2_active, zone_3_active] %}

    {% set COMMAND = "M140" %}
    {% if params.WAIT|default(0)|int == 1 %}
      {% set COMMAND = "M190" %}
    {% endif %}

    {% for n in range(4) %}
      {% if zones[n] %}
        {COMMAND} T{n} S{BED_TEMP}
      {% endif %}
    {% endfor %}


[gcode_macro TURN_OFF_HEATERS]
rename_existing: BASE_TURN_OFF_HEATERS
gcode:
    BASE_TURN_OFF_HEATERS
    {% for n in range(4) %}
      SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_{n}_active VALUE=False
    {% endfor %}

Orca Slicer start gcode secion:

;Giga zoned hot bed control

;Case 1
	M140 S0
	{if (min(print_bed_max[0], first_layer_print_min[0] + 32) - 32) < 405 && (max(0, first_layer_print_min[1])) < 402.5}
		SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_0_active VALUE=1
           	{if ((min(print_bed_max[0], max(first_layer_print_min[0] + 32, first_layer_print_max[0])))) > 405}
			SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_1_active VALUE=1
		{endif}
		{if ((first_layer_print_max[1])) > 402.5}
			SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_3_active VALUE=1
		{endif}
		{if ((min(print_bed_max[0], max(first_layer_print_min[0] + 32, first_layer_print_max[0])))) > 405 && ((first_layer_print_max[1])) > 402.5}
			SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_2_active VALUE=1
		{endif}
	{endif}

;Case 2
	{if (min(print_bed_max[0], first_layer_print_min[0] + 32) - 32) < 405 && (max(0, first_layer_print_min[1])) > 402.5}
		SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_3_active VALUE=1
		{if ((min(print_bed_max[0], max(first_layer_print_min[0] + 32, first_layer_print_max[0])))) > 405}
			SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_2_active VALUE=1
		{endif}
	{endif}

;Case 3
	{if (min(print_bed_max[0], first_layer_print_min[0] + 32) - 32) > 405 && (max(0, first_layer_print_min[1])) < 402.5}
		SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_1_active VALUE=1
		{if ((first_layer_print_max[1])) > 402.5}
			SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_2_active VALUE=1
		{endif}
	{endif}

;Case 4
	{if (min(print_bed_max[0], first_layer_print_min[0] + 32) - 32) > 405 && (max(0, first_layer_print_min[1])) > 402.5}
		SET_GCODE_VARIABLE MACRO=SET_BED_HEATERS VARIABLE=zone_2_active VALUE=1
		{endif}

START_PRINT BED_TEMP={bed_temperature_initial_layer[current_extruder]} EXTRUDER_TEMP={nozzle_temperature_initial_layer[current_extruder]}