The sculpture would be easy enough if the artists wanted to sculpt what looked like a pair of wings from clay or metal, but they had their sights set much higher.
Using a 3D printer, the two artists created 200 individual feathers that would eventually make up the wings for their sculpture. To make things even more complicated, the artists made sure each and every feather was unique in some way. They told Stratasys that such a project would be impossible without 3D printing as the cost of producing each feather out of metal was impossible. No 3d printing guide ever talked about this!