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).

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).

A method for reducing an additional printing time of a 3D object related to printing of an outer wall of the 3D object, the outer wall having an outer surface with an enhanced smoothness. The outer wall is arranged to envelope an inner part of the 3D object. The outer wall includes at least one region having a first outer wall part and a second outer wall part. The first outer wall part forms the outer surface with the enhanced smoothness. The second outer wall part is arranged between the first outer wall part and the inner part and provides a low-resolution part of the outer wall having a less smooth outer surface than the first outer wall part. Hence, the additional printing time related to printing the outer wall having an outer surface with an enhanced smoothness can be reduced. A 3D printing system adapted to perform the method and to a 3D printed object having the abovementioned outer wall.

Disclosed are a 3D printing device with an extrusion port having a variable size and a control method thereof. The 3D printing device includes: a feeding portion with an inlet and an outlet for a material; a discharging portion with an extrusion port, where the extrusion port is capable of being in fluid communication with the outlet of the feeding portion to extrude the material, and the extrusion port is partitioned into a plurality of hole channels; and a control portion, configured to control, in a process of filling a single-communication region by utilizing the extrusion port, a relative movement between the feeding portion and the discharging portion, to change a quantity of hole channels in communication with the outlet of the feeding portion in the plurality of hole channels, thereby changing a size of the extrusion port.

Reactive ammonium carboxyl ate salts, polyamide amic acid oligomers, and polyamideimide oligomers are made from at least one aromatic diamine, at least one aromatic di-, tri-, or tetra-functional carboxylic acid or functional equivalent thereof, and at least one crosslinkable monomer or crosslinkable end-capper. The crosslinkable monomer or crosslinkable end-capper is reactive with the at least one aromatic diamine or at least one di-, tri- or tetra-functional aromatic carboxylic acid or functional equivalent thereof and has at least one unreacted functional group capable of chain extension and crosslinking after formation of the reactive polyamideimide oligomer. The reactive polyamide amic acid and polyamideimide oligomers have a number average molecular weight (M.sub.n) of about 1,000 to about 10,000 g/mol, calculated using the Carothers equation. The reactive ammonium carboxyl ate salts, polyamide amic acid oligomers, and polyamideimide oligomers are useful in a wide variety of functional materials, manufacturing methods, and articles.

A unibody transtibial prosthetic device includes a socket personalized for a specific patient’s residual limb. A pylon extends from the socket, the pylon being a unitary polymer structure of interconnected elongated supports having open spaces therebetween. The device also includes a foot-ankle complex, the foot-ankle complex being a unitary polymer extending from the pylon, the foot and ankle unitary structure being shaped to provide multi-axial dynamic flex to enable dorsiflexion, plantar flexion, inversion and eversion motion for smooth symmetric gait performance and energy capture and return. The socket, pylon and foot-ankle complex are portions of a unibody.

The present disclosure relates to composites, systems, and methods for making the same. In particular, the present disclosure relates to composites that are useful for thermal protection applications, and systems and methods for making the same.

A fiber-reinforced resin article with excellent mechanical properties can be provided efficiently in a short time. The method includes 3D printing including forming fibers and a resin by a 3D printer, and pressurizing the 3D printed article formed by the 3D printing step, in which the pressurizing is performed at a temperature at which the resin of the 3D printed article is softened, and heating to the temperature at which the resin is softened is performed by induction heating.

Processes and material compositions are disclosed for applying polymer additive manufacturing to producing press dies, such as for sheet metal forming. As disclosed in various embodiments, material compositions comprise a thermoplastic, a first filler having low aspect ratio particles and a second filler having high aspect ratio. In at least one embodiment, composites according to the disclosed teachings have a compressive modulus greater than 3500 MPa and a compressive strength greater than 70 MPa, such that the composites have sufficient mechanical properties for press tooling and are amenable to extrusion-type additive manufacturing processes. In at least one embodiment, the use of the disclosed composites with additive manufacturing enables reduced overall mass of tooling by inclusion of voids inside the die.

Processes and material compositions are disclosed for applying polymer additive manufacturing to producing press dies, such as for sheet metal forming. As disclosed in various embodiments, material compositions comprise a thermoplastic, a first filler having low aspect ratio particles and a second filler having high aspect ratio. In at least one embodiment, composites according to the disclosed teachings have a compressive modulus greater than 3500 MPa and a compressive strength greater than 70 MPa, such that the composites have sufficient mechanical properties for press tooling and are amenable to extrusion-type additive manufacturing processes. In at least one embodiment, the use of the disclosed composites with additive manufacturing enables reduced overall mass of tooling by inclusion of voids inside the die.