Patent ID: 7314591

Claim:
An additive-process method for building a three-dimensional model comprising: providing a solid feedstock of a first thermoplastic material to at least one extrusion head; melting the solid feedstock of the first thermoplastic material in the at least one extrusion head; depositing layers of the first thermoplastic material from the at least one extrusion head into a heated build chamber to form the three-dimensional model; providing a solid feedstock of a second thermoplastic material to the at least one extrusion head; melting the solid feedstock of the second thermoplastic material in the at least one extrusion head; and depositing layers of the second thermoplastic material into the heated build chamber to form a support structure for the three-dimensional model, wherein the second thermoplastic material contains between about 0.5 and 10 weight percent of a silicone release agent.