G21 ;metric is good!
G90 ;absolute positioning
T0; select new extruder
G92 E0 ;zero the extruded length
G92 X0
G92 Y0
G92 Z0
G92 E0 ;zero the extruded length
G1 F1500.0; feed for start of next move
;G1 X2.0 Y2.0 F3000.0 ;horizontal move
;G1 X3.0 Y3.0 ;horizontal move
G1 Z1 F70
M109 S175.0 ;set temperature and wait
G1 F15000.0; feed for start of next move
E300.0 G1 F3000; extruder dwell
G1 F4500.0; feed for start of next move
G92 E0 ;zero the extruded length