G21
G90
G1 X5 F400
G1 X0
G1 F200
G1 X10
G1 F400
G1 X20
G1 X20.001
G1 X20.002
G1 X20.003
G1 X25
G1 X0
M2
(run this with STEPS_PER_M_X < 500000)
(for example, the typical 80000)