Here is an example of a 3D core (1.8" diam) to a 3 piece rubber mold made out of 7075. The core is the path for fluid in a rubber sleeve (the other 2 halves form the outside shell). The outside of the core was finished with a 3/16 ball in 0.012 steps. The finish is much better than it looks. All cut on a Hurco VM-1 with Bobcad. The drawing was points, curves, splines, lines, and mostly surfaces.
The core was indexed with dowel pins and fully cut on one side then flipped over to fully cut the other side. I was off by about 0.007 with the pins. You will have to forgive me.
A 1" flex belt sander with 180 grit was used to clean up the rest of the surface. It would have taken too long to run more passes at a smaller step over for minimal results. The cusps from the ball mill were around 0.0008 to 0.006 depending upon location.
The face is canted at a 28 degree angle. The square portions coming out from the center were used to index the core to the mold halves. The rubber is squeezed and heated (10K-40K lbs at 325 degrees). The flashing on the finished part is about 0.005 to 0.010 thick (heat and pressure do that).
You can make complex parts with Bobcad. It is just a matter of how you apply it.

mc_n_g

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Nice work. I've been trying to talk my brother into doing some stamping/injection stuff but its a bit much for our setup. I'm always intrigued by it. Maybe someday!