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A Purge Filament Macro

The following is based on a 0.4mm nozzle

[gcode_macro PURGE]
description: purge filament
gcode:
	;
	; simply purges enough filament to flush the tool
	;
	G90 ; absolute positioning mode
	G28 ; home
	G1 Z10 F300 ; raise Z by 10 to be safe
	G1 X67.5 Y0 F6000 ; move to start of purge line
	G1 Z0 F300 ; drop nozzle to plate surface
	M109 S220 ; heat extruder and wait
	G92 E0 ; reset extruder
	G1 X67.5 Y0 Z0.4 F300 ; move to start xyz position
	G1 X167.5 E80 F400 ; draw the first line
	G0 Y2 F120
	G1 X67.5 E60 F400 ; draw the second line
	G0 Y4 F120
	G1 X167.5 E30 F400 ; draw a third line
	G1 Z10 F300 ; raise Z by 10 to be safe
	G92 E0 ; reset extruder