Hi flim, can you please send me a .dxf file that doesn't work? You can post it here or e-mail it to me at moi@moi3d.com . Then I'll be able to take a look at it and see what's going on. MoI currently supports LINE, CIRCLE, ARC, POINT, POLYLINE, ELLIPSE, and SPLINE entities in dxf files.

3D solids are encrypted in DXF files and so are not read, you would instead need to use one of .3dm, STEP, IGES, or SAT file formats for transferring surfaces and solids.

- Michael