Hi Paul, probably your best bet at the moment would be to use Rhino (http://rhino3d.com) to convert your curves to DXF format.

I do plan on adding DWG and DXF support to version 2.

But I think it may be possible for me to cook up a basic 3DM to DXF conversion program before then that might work. It would be pretty basic, probably just break curves into polylines and not try to convert circles as circle entities, etc... Do you think that would do the job?

If so, maybe you can send me a few example DXF files zipped up to me at moi@moi3d.com. I'll take a look at them and see if it might be possible for me to do a kind of basic converter program.

- Michael