Noise suppressors for firearms are disclosed, having a cylindrical body extending along a longitudinal direction, a chamber having an annular cylindrical shape, and a suppression core in the chamber. The chamber has an outer diameter defined by an inner surface of the body, an inner diameter forming a center bore, and a length along the longitudinal direction. The suppression core has a triply periodic minimal surfaces (TPMS) structure. A wall thickness or unit cell size of the TPMS structure may vary along longitudinal or radial directions. The suppression core may have an inner portion and an outer portion, where at a transition between the inner and outer portions, a plurality of first openings in the inner portion and a plurality of second openings in the outer portion have a parameter that matches in size with each other, and the first and second openings are approximately aligned with each other.

An impeller includes a central, shaft or a tube for mounting on a shaft, a hollow hub is located around the shaft or tube, and a series of blades are attached to the outside of the hub by their bases. A reinforcing rib is provided for each blade, and extends on the shaft or tube in a radial direction and forms a facial connection between the shaft or tube and the inside of the hub at a position opposite the attachment of the base of a blade concerned.

A heat sink and method of making the same. The heat sink having one or more helical fins. The helical fins configured such that the pressure field on either side of the fin is asymmetric.

A heat exchanger includes a first set of fins, a second set of fins, and an exterior wall. The first set of fins extend radially and are coaxial with each other. The first set of fins forms a first set of channels. The second set of fins extend radially and are coaxial with each other. The second set of fins forms a second set of channels. Channels of the first and second sets of channels are disposed in an alternating pattern in a circumferential direction of the heat exchanger. The first and second sets of fins are integrally formed together. A cross-sectional width of a channel of at least one of the first set of channels and the second set of channels increases as a radial distance from a centerline axis of the heat exchanger increases.

A method of heat-treating an additively-manufactured ferromagnetic component is presented and a related ferromagnetic component is presented. A saturation flux density of a heat-treated ferromagnetic component is greater than a saturation flux density of an as-formed ferromagnetic component. The heat-treated ferromagnetic component is further characterized by a plurality of grains such that at least 25% of the plurality of grains have a median grain size less than 10 microns and 25% of the plurality of grains have a median grain size greater than 25 microns.

The system and method for an additively manufactured self-destructive delay device is a bellow/lattice structure or other form. The device may be installed as a replacement to a previous device, where the device yields under the deployment force at a specific rate to match the time-displacement curve established by a previous hydraulic delay device. The delay device has a virtually unlimited lifespan, is cheap to manufacture, and can be adaptable to other loads and conditions for use in or on other platforms. This solution can be applied anywhere where mechanical delay devices are needed within systems. Some examples include wing/fin deployment mechanisms, safety crumple zones, or devices that act as shear pins.

A build plate system includes a body defining at least one cavity. An insert is sized and shaped to fit within the at least one cavity such that the at least one cavity orients the insert for forming at least a portion of a screw shaft thereon by a manufacturing method using an additive manufacturing apparatus. In some embodiments, systems, spinal constructs, surgical instruments and methods are disclosed.

A build plate system includes a body defining at least one cavity. An insert is sized and shaped to fit within the at least one cavity such that the at least one cavity orients the insert for forming at least a portion of a screw shaft thereon by a manufacturing method using an additive manufacturing apparatus. In some embodiments, systems, spinal constructs, surgical instruments and methods are disclosed.

A bone fastener includes a screw shaft having a proximal portion and a distal portion. The proximal portion is formed by a first manufacturing method and defines a distal face. The distal portion is formed onto the distal face by a second manufacturing method. In some embodiments, systems, spinal constructs, surgical instruments and methods are disclosed.

A method for producing a hollow, helical, electrically conducting body. The method comprising: producing a helical core made of a core material that can be at least one of liquefied and evaporated under the action of heat; coating the helical core with a first powder layer of an at least partially electrically conducting powder using a powder coating method; heating the helical core and the first powder layer to a first temperature, at which the helical core is at least one of liquefied and evaporated and at which the first powder layer is at least partially solidified in porous form, the core material exiting space surrounded by the first powder layer; and after the core material has exited the space surrounded by the first powder layer, sintering the first powder layer by heating the first powder layer to a second temperature, which is higher than the first temperature.