@unknownuser said: Are the "units of measure" for each native file the same? Good question Modelhead. There is a bug in SU:s DWG export function, that ignores any metric units settings. As at least ACAD 2008 is much more scale-aware than the older ones, I have to open my exported files in ACAD first and change the unit settings before importing the file into my ACAD drawing or model. Otherwise the it will import 25.4 times too large. Anssi