Hollow representation of a solid?

 From:  Bob (PHOTON713)
4356.3 In reply to 4356.2 
Good Afternoon, Michael...thanks for the link. I'll check it out. Since most service
bureaus charge by the volume of material used, it would be a money saver if I can
create only the outline. My horseshoes typically use 9.75 cubic inches of material.
Providing only a hollow version strong enough for casting should reduce volume by
50% or more....Regards...Bob