I think you need a Z, M666 Z-1.68. It is also case sensitive. So only use capital letters.
M666 Z-1.68
G28 Z
Measure again, of that’s good, then M500.
I think you need a Z, M666 Z-1.68. It is also case sensitive. So only use capital letters.
M666 Z-1.68
G28 Z
Measure again, of that’s good, then M500.