# US 12,759,221 B2 · System for rapid object production using additive infill design > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,759,221 B2 - Document ID: US12759221B2 - Status: Granted - Kind: B2 - Application number: 18/003,709 - Filed: 2021-05-03 - Published: 2023-07-27 - Granted: 2026-10-13 - Earliest claimed: 2020-07-02 - Assignees: PPG Industries Ohio, Inc. - Applicants: PPG Industries Ohio, Inc. - Inventors: Cynthia Kutchko; Michael Anthony Bubas; Bryan William Wilkinson; Kerianne Mercilene Dobosz - Web page: https://patentgrep.com/patent/US12759221B2 ## CPC - B29C 64/118: using filamentary material being melted, e.g. fused deposition modelling [FDM] - B29C 64/314: Preparation - B29C 64/336: of two or more materials - B29C 64/35: Cleaning - B29C 64/386: Data acquisition or data processing for additive manufacturing - B33Y 10/00: Processes of additive manufacturing - B33Y 30/00: Apparatus for additive manufacturing; Details thereof or accessories therefor - B33Y 50/00: Data acquisition or data processing for additive manufacturing - B33Y 70/10: Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING ## Abstract A computer system (110) for part production using additive design receives a computer-aided design (CAD) file that describes physical dimensions of a target object (120). The computer system (110) identifies a physical boundary portion (300) of the target object within the CAD file. The computer system determines a target flow rate to infill the physical boundary portion (300) with the infill material. Additionally, the computer system (110) generates a first tool path to flow infill material into the physical boundary portion (300). Further, the computer system (110) sends instructions to a computer system in communication with a dispenser (100) that cause the dispenser to implement the first tool path while flowing the infill material into the physical boundary portion (300). ## Claims ### Claim 1 A computer system for part production using additive infill design, comprising: one or more processors; and one or more computer-readable media having stored thereon executable instructions that when executed by the one or more processors configure the computer system to perform at least the following: receive a computer-aided design (CAD) file that describes physical dimensions of a target object; identify a physical boundary portion of the target object within the CAD file, wherein the physical boundary portion comprises a portion of the target object that encloses infill material; detect, with a computer vision system, a pre-existing physical boundary portion, wherein the computer vision system provides data to match the pre-existing physical boundary portion with the physical boundary portion of the target object within the CAD file, and wherein the computer vision system utilizes the CAD file to identify the pre-existing physical boundary portion based on the matching; determine a target flow rate to infill the physical boundary portion with the infill material; generate a first tool path to flow the infill material into the physical boundary portion, wherein: the infill material comprises a coreactive material, and the infill material comprises a mixture of two different materials and a volume mix ratio of the mixture of the two different materials is dynamically varied as a gradient during movement of a dispenser over the first tool path, as a function of spatial position along the first tool path, such that the mixture dispensed at different spatial positions along the first tool path comprises different respective mix ratios; send instructions to the dispenser that cause the dispenser to implement the first tool path while flowing the infill material into the physical boundary portion; generate a second tool path to additively manufacture the physical boundary portion; and send instructions to the computer system in communication with another dispenser that cause the other dispenser to implement the second tool path while flowing boundary material to form the physical boundary portion, wherein the second tool path and the first tool path are implemented simultaneously. ### Claim 2 (depends on 1) The computer system of claim 1, wherein the generation of the first tool path is based, at least in part, upon the target flow rate. ### Claim 3 (depends on 1) The computer system of claim 1, wherein the generation of the first tool path comprises a portion where the dispenser is allowed to coast and continue to extrude remaining material that is within the dispenser. ### Claim 4 (depends on 1) The computer system of claim 1, wherein the infill material and the boundary material comprise the same composition. ### Claim 5 (depends on 1) The computer system of claim 1, wherein the boundary material comprises a thermoplastic. ### Claim 6 (depends on 1) The computer system of claim 1, wherein the executable instructions include instructions that are executable to configure the computer system to: receive an indication of a material to be used as the infill material to create the target object; access, from a material database, characteristics of the material, wherein the characteristics of the material comprise a viscosity of the material; and determine the target flow rate using the characteristics of the material. ### Claim 7 (depends on 1) The computer system of claim 1, further comprising a three-dimensional printer, the three-dimensional printer comprising the dispenser. ### Claim 8 A method for part production using additive infill design, comprising: receiving, at one or more processors, a computer-aided design (CAD) file that describes physical dimensions of a target object; identifying, with the one or more processors, a physical boundary portion of the target object within the CAD file, wherein the physical boundary portion comprises a portion of the target object that encloses infill material; detecting, with a computer vision system, a pre-existing physical boundary portion, wherein the computer system provides data to match the pre-existing physical boundary portion with the physical boundary portion of the target object within the CAD file, and wherein the computer vision system, and wherein the computer vision system utilizes the CAD file to identify the pre-existing physical boundary portion based on the matching; determining, with the one or more processors, a target flow rate to infill the physical boundary portion with the infill material; generating, with the one or more processors, a first tool path to flow the infill material into the physical boundary portion, wherein: the infill material comprises a coreactive material, and the infill material comprises a mixture of two different materials and a volume mix ratio of the mixture of the two different materials is dynamically varied as a gradient during movement of a dispenser over the first tool path, as a function of spatial position along the first tool path, such that the mixture dispensed at different spatial positions along the first tool path comprises different respective mix ratios; sending instructions to the dispenser that cause the dispenser to implement the first tool path while flowing the infill material into the physical boundary portion; generating a second tool path to additively manufacture the physical boundary portion; and sending instructions to another dispenser that cause the other dispenser to implement the second tool path while flowing boundary material to form the physical boundary portion, wherein the second tool path and the first tool path are implemented simultaneously. ### Claim 9 (depends on 8) The method of claim 8, wherein the generation of the first tool path is based, at least in part, upon the target flow rate. ### Claim 10 (depends on 8) The method of claim 8, wherein the generation of the first tool path comprises a portion where the dispenser is allowed to coast and continue to extrude remaining material that is within the dispenser. ### Claim 11 (depends on 8) The method of claim 8, wherein the infill material and the boundary material comprise the same composition. ### Claim 12 (depends on 8) The method of claim 8, wherein the boundary material comprises a thermoplastic. ### Claim 13 (depends on 8) The method of claim 8, further comprising: receiving an indication of a material to be used as the infill material to create the target object; accessing, from a material database, characteristics of the material, wherein the characteristics of the material comprise a viscosity of the material; and determining the target flow rate using the characteristics of the material.