Hi Michelle, yes DXF export only generates visible/hidden lines and not things like silhouettes and outline curves.

PDF/AI/SVG output generates those things to make a type of 2D illustration style output which is usually done with 2D vector drawing programs and not usually with 2D CAD programs which is what DXF format is more associated with.

- Michael

Hi Michele,

Are you maybe trying to do something like prepare artwork for CAM like for a laser engraver, vinyl plotter, or CNC router? Do you want to engrave/route/plot a line drawing of a 3D model?

You probably already know all of this, but just in case: There's a plugin for Illustrator that's good for removing short lines and there's a macro for CorelDraw http://makerspacemobile.org/wiki/index.php/GCC_Venus for removing duplicate lines, though I don't have experience with that macro.

Have you considered saving the AI / SVG / PDF output as a high resolution bitmap and then vectorizing (tracing) the bitmap in Corel or Illustrator?

Nice script by the way! Looks quite advanced :)