I'm having problems importing DraftSight dxf-files into Comsol Multiphysics. We had a dxf-file that worked fine in Comsol, but was too complicated for FEM calculations, so we spent a few hours re-working it in DraftSight (removed lines, re-position, re-scale). However, now the file is not accepted by Comsol, regardless of which dxf-format I use.  Strangely enough, I get different error messages when I try to open it in Comsol. If I try to open an Ascii file, Comsol says "The imported file did not contain any geometries". When I try to open a binary file, Comsol says "DXF file is corrupt. Line number 1".

Any ideas what could be wrong? Thanks!