Casting a Catfish Fin Bone in Aluminum. This is the pectoral spine (and socket) from a 20 lb flathead catfish. The bone has very interesting features and textures, so I wanted to try this fairly complicated technique to try to make a cast of it. First, I create 3D models of the bones separately using photogrammetry. This involves taking many photos from different angles and using software to build the model. Pour funnels (sprues) are then added to the models. The models are 3D printed at 2× thei