| Patrick Sherwood assisting with depowdering the
Two 3D printers were used to build the plaster models: The small umbrella models were printed with a Z-Corp 310-plus printer. Restaurant Los Manantiales, the
shell for Cosmic Rays, Bacardi, and the
large Milagrosa models were printed with
a Z-Corp 810 printer located at the Port Authority of New York and New Jersey. These models could not have been built without the generosity of the Princeton University MAE department or the Port Authority.
The same general process was used to create each plaster model. First, students used the computer program Rhino to develop a rendering of a structure based on Candela’s drawings. This rendering is sent to a 3D printer that builds the model in discrete layers of plaster powder and adhesive with a technology similar to that of paper and ink used by inkjet printers.
A mechanical arm sweeps a layer of powder over the build space and ejects a pattern of adhesive where the model is positioned. The process repeats until the model is complete. Once the model dries it is carefully excavated from the build space (bulk depowdering) by scooping/ brushing away the unbound powder in which it is submerged. Fine depowdering is achieved with an air gun. The model is strengthened with an epoxy and finished by painting with a white primer.