O ok, I know what it is, I will post it when I get home, I am not that much worried about the heat of the steppers at the moment but I am about the Drivers, I think that this could be my problem to the off center.. But I think that if it was the heat that causes the movement to be off it would have been irregular, but it is not, it just works skew, the thing that boggles my mind is that when I run a G-code rough cut it all looks fine. then when I run a finishing program for the same job it starts fine but progressively moves in the X+ direction ?? puzzles me .