Thanks for that video it looks good im going to look into it further.

In the meant time I've got the y axis moving now, it's great in one direction so with the flanged edge of the ballnut leading. However in reverse back end of lead screw leading it sounds like a wood pecker. Click click click every rotation. Any ideas? It's all greased up with lithium grease, not enough grease? Crap in the nut? Don't get it on the z axis