Patent ID: 8801990

Claim:
A method for building a three-dimensional object with an additive manufacturing system having a heated build chamber and an extrusion head, the method comprising: feeding a consumable filament to the extrusion head, the consumable filament comprising a longitudinal length, a core portion extending along the longitudinal length, and a shell portion extending along the longitudinal length and substantially encasing the core portion, wherein the core portion compositionally comprises a first semi-crystalline polymeric material, and wherein the shell portion compositionally comprises a second semi-crystalline polymeric material having a peak crystallization temperature that is greater than a peak crystallization temperature of the first semi-crystalline polymeric material; melting the fed consumable filament in the extrusion head to form a molten material; depositing the molten material in the heated build chamber as an extruded road that defines at least a portion of a layer of the three-dimensional object, wherein the extruded road comprises a core region of the first semi-crystalline polymeric material, and a shell region of the second semi-crystalline polymeric material; crystallizing at least a portion of the second semi-crystalline polymeric material of the shell region prior to formation of a subsequent layer of the three-dimensional object; and crystallizing at least a portion of the first semi-crystalline polymeric material of the core region after crystallizing the portion of the second semi-crystalline polymeric material of the shell region.