Next, Campana makes a fiberglass cast of the part of the animal’s body where the device will attach. If the animal lives in another country, like Jabu, Campana sends a casting kit to the animal’s caregivers. The kit contains materials and instructions for the caregivers to make their own fiberglass cast. A fiberglass cast is made of a light, durable plastic that can be shaped firmly around a limb or partial limb to capture an impression. After they make the cast, the caregivers mail it back to Campana.
When Campana is building a brace to support a limb that is damaged or injured but not missing, he may make a cast of an entire injured leg. If he’s building a prosthesis, he makes a cast of the stump that’s left of the limb. Once the hard cast is removed, Campana fills it with plaster to make a copy of the animal’s anatomy that he can work with.
Campana then uses soft plastic to shape the prosthesis or brace tightly around the plaster. He makes some prosthetic pieces with a 3-D printer—a machine that creates plastic objects using a layering method based on a design Campana inputs. Finally, Campana adds bolts, gears, and other pieces to allow the device to move like a real limb. He often adds a layer of textured material, called a tread, to the bottom of the device. That provides traction, which keeps the animals from sliding when they walk.