1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
(Square-wave shape) G20 G90 G61 G0 X0 Y0 Z0 G64 G1 X1 F9999 Y1 X2 Y0 X3 Y1 X4 Y0 X5 Y1 X6 G0 Z1 X0 Y0 Z0 M30