How to include Curves in export file

I will be creating crosshatch mark on the surface of my object using the Project command. What I would like to do is include this in my export file so that it can be used for engraving in my Cam software. I normally export in a STEP format, but am open to other formats that would have this ability.

The crosshatch marking will be simple curves on the surface, and then once I’m in my Cam software I will select these for the engraving.

Any suggestions ?



Hello - Iges and Step will both export 3d curves.