Quote Originally Posted by bigmikeinil View Post
roxy thats the wierd thing, with that setting for z-axis default steps when i move it up 100mm in pronterface it measures out to 100.02mm but when i go to print something i get 50% print height
And that is a big reason why you ought to try the smaller numbers for Feedrate and Acceleration. It is possible your stepper motors can't keep up. Pronterface isn't going to use highly aggressive numbers for manually moving the carriage around. They are going to use numbers that work for everybody. So if it works when you are manually moving things around in Pronterface but not with your GCode... It is possible the GCode numbers are too aggressive.

I'm not saying this is the problem. But I am saying I would back off my numbers until the problem is understood.