ist a bit tricky, here are my file-settings for a proper Illustrator export. I’m always using model scale for an 1:1 output. Then in Illustrator comes the fun part: as the exported file has no paper size set, Illustrator is using the size of the last document created (e.g… last document was A4, the exported .AI from Rhino will be opened as A4), the origin (e.g… 0,0,0) will be the center of the new Dokument.
Hope this will help you (and sorry for the german screenshots)
jan_j, are you sure your drawing is at 0,0,0 world coordinates? I made that mistake when I had accidentally moved my CPlane, and my drawing was at 0,0,0 CPlane coordinates, not world coordinates. And my CNC cutter complained that everything was out of range on his machine…