Ender 3v2 Modified Start GCode (Adaptive Purge)

start.gcode

G90 ; use absolute coordinates
M83 ; extruder relative mode
M140 S[bed_temperature_initial_layer] ; set final bed temp
M104 S150 ; set temporary nozzle temp to prevent oozing during homing
G4 S10 ; allow partial nozzle warmup ; dwell 10 seconds
G28 ; home all axis
G29 A ; (DW) Activate UBL Mesh
G0 Z25 F240
M104 S[nozzle_temperature_initial_layer] ; set final nozzle temp
M190 S[bed_temperature_initial_layer] ; wait for bed temp to stabilize
M109 S[nozzle_temperature_initial_layer] ; wait for nozzle temp to stabilize
G92 E0 ; reset extruder

; DW - Check if our adaptive purge line will fit on the bed
{if first_layer_print_min[0] < 10 || first_layer_print_min[1]+40 > print_bed_max[1] }

	; DW - Fixed purge
	G0 X2 Y10 Z5 F6000 ; position 10mm left from the lower left of the first layer
	G0 Z0.28 F240
	G1 X2 Y40 E30 F360 ; extrude 30mm of filament in the y direction
	G92 E0.0 ; reset extruder
	G1 E-0.5 F2100 ; small retraction
	G0 Y50 F6000.0 ; move an additional 10mm without extruding

{else}

	; DW - Adaptive purge
	; DW - see: https://www.youtube.com/watch?v=PqcEz09jQ7c
	; DW - and: https://www.printables.com/model/1035759-adaptive-purge-for-any-3d-printer-using-slicer-var
	G0 X{first_layer_print_min[0]-10} Y{first_layer_print_min[1]} Z5 F6000 ; position 10mm left from the lower left of the first layer
	G0 Z0.28 F240
	G1 X{first_layer_print_min[0]-10} Y{first_layer_print_min[1]+30} E30 F360 ; extrude 30mm of filament in the y direction
	G92 E0.0 ; reset extruder
	G1 E-0.5 F2100 ; small retraction
	G0 Y{first_layer_print_min[1]+40} F6000.0 ; move an additional 10mm without extruding

{endif}

G92 E0 ; reset extruder