cheers well I had a go at this today and I got them all working nice and got them all a lot faster however went to run a file and when it did some very small z moves it started tripping out again so I had to massively reduce the z back down again especially with the acc. Im wondering if maybe changing the ball screw would help so the motor was spinning a little faster and the weight of the z was overcome a little more, I think its on a 1605 at the moment.