I guess this is really about file conversion ,

We are converting an old CNC nameplate engraver to a 3D printer and also still use it as an engraver

How can we use the same data file in EPS or ??? , lets say the name "DOGBONE" , print it on the 3D printer

then run the router and cut it as a positive and also be able to cut a negative ( cavity )

The idea is to print "DOGBONE" on the 3d printer , see that it is OK, and then either cut 10 pieces out of wood or cut a cavity in MDF to make waxes to cast.....

I would not do his on every project, I just want the flexability to do all 3 things

My buddy who has build many 3D printers is doing most of the conversion , he knows 3D printing but not the CNC part .

Any advise appreciated

hopefully my discription is not "as clear as mud"