Patent ID: 8287959

Claim:
A method of building a three-dimensional object with a syringe deposition tool of a layered deposition system, wherein the syringe deposition tool includes an extrusion syringe and a syringe tip assembly, the method comprising: applying a biasing pressure to separate a syringe body of the extrusion syringe and a nozzle of the syringe tip assembly with a biasing member of the syringe tip assembly that is disposed between the syringe body and the nozzle; applying pressure to a piston of the extrusion syringe; compressing the biasing member due to the pressure applied to the piston; moving the piston through the syringe body after at least partially compressing the biasing member, wherein moving the piston through the syringe body extrudes a material through a syringe tip of the extrusion syringe and through the nozzle; and removing at least a portion of the pressure applied to the piston such that the applied biasing pressure is greater than the pressure applied to the piston, which at least partially decompresses the biasing member to form a volume within the syringe tip assembly to retain at least a portion of the material further comprising: positioning a seal component of the syringe tip assembly around at least the portion of the syringe tip of the extrusion syringe; positioning the biasing member against the seal component; and positioning the nozzle of the syringe tip assembly against the biasing member, thereby retaining the biasing member between the seal component and the nozzle.