Hi Mark, I do want to look into adding in a DXF exporter in the future.


Right now the easiest way to get curves into DXF format is to use the converter from here:
http://moi3d.com/wiki/Resources#3dmCurves2DXF_converter

That's a small separate program I wrote that can extract the curves from a 3DM file and then generate a DXF file with spline entities in it.


For AI format to maintain the correct size make sure your model units in MoI are set to either millimeters, centimeters, or inches (and not just "no unit system"), and then when you export to AI make sure the "Fit to page" option is not checked.

- Michael