Prints too long in the Z direction

I have found that all my prints seem to be to large in the Z direction. However it is not the whole object that is scaled wrong. It seem that just the first few layers on the bed seem to be extra thick, causing the whle print to be 1-1.25 mm too big. I hope a solution can be found for this. It really is a problem when printing precision parts, and i cant change all my cad files to account for this error. 

We are looking into the problem, will provide a fix soon.