Using GRBL controller, everything works right when I send my files except the z axis, it simply does not respond, Manual commands work perfectly as well the axis controls by
keyboard. I am attaching the beginning of a file, maybe someone can see something I don't, thanx

G00 G90 G17 G21
M3 S24000


(Contour 0)
T1 M6
X-70.877 Y110.684
G01 Z-2. F150
X-70.842 F450