that was totally what i want thanks a lot

@kertif said: i finally found a way in autocad i saved the file as pdf, then by a pdf-to-dwg converter program i created a dwg file again, when i import this dwg to sketchup it is already in 2d thanks again for all your help There is also a "flatten" command in AutoCad, it is part of the optional Express tools set. Anssi