Abstract: Methods of preparing a particulate build material for three-dimensional printing can include loading fresh particulate build material including from about 80 wt % to 100 wt % fresh metal particles into a mechanical mixer, and mechanically conditioning the fresh particulate build material to generate conditioned particulate build material including conditioned metal particles. The fresh metal particles can have a surface oxide layer, and the fresh particulate build material can have a particle size distribution with a D10 particle size from about 2 ?m to about 10 ?m, a D50 particle size from about 5 ?m to about 20 ?m, and a D90 particle size from about 20 ?m to about 40 ?m. The conditioned particulate build material can include a modified cohesive index (compared to the fresh conditioned particulate build material) ranging from about 25 cohesive index units to about 35 cohesive index units.

Abstract: A varying a composition of build material used for a three dimensional (3D) part formed by a 3D printer are disclosed. In a system provided, a number of vessels for build material are included, wherein each vessel includes a feeder coupled to a conveying system. The conveying system conveys and blends build material from the vessels. A controller is configured to adjust a composition of the build material by adjusting an amount of material added from each of the vessels by controlling the feeder on each of the vessels.

Abstract: A 3D printer is disclosed herein. The 3D printer comprises a build material distributor to generate layers of a build material in a spreading direction along a spreading axis; a resonator mounted on the build material distributor to vibrate the build material distributor along the spreading axis at a frequency; and a controller. The controller is to control the resonator to vibrate the build material distributor at the frequency while controlling the build material distributor to spread a volume of build material over a platform to generate a layer of build material.

Abstract: Example implementations relate to different mixtures of build materials deliverable during a three dimensional (3D) print operation. In some examples, a 3D print apparatus may include a delivery hopper to deliver build material to a print zone of the 3D print apparatus and a plurality of build material hoppers to which the delivery hopper is connected for receipt of at least one of a corresponding plurality of build materials. A controller of the 3D print apparatus may direct that variable proportions of a first build material relative to a second build material are receivable by the delivery hopper from the plurality of build material hoppers during the 3D print operation, where different mixtures of the variable proportions of the first build material and the second build material are deliverable to the delivery hopper during the 3D print operation.

Abstract: In some examples, a method includes applying a negative pressure to a gas-filled volume through a vent. While a pressure in the volume decreases, the method draws a gas out through the vent and moves a liquid into the volume. The volume is filled with the liquid so that one side of the vent is covered with the liquid and the pressure in the volume increases up to a specified point.

Abstract: A build device and a method of operating the build device are disclosed. In a method provided, a build material is directed to an intermediate vessel from a conveying line. The build material is separated from an air stream and dropped into the intermediate vessel. The intermediate vessel is emptied between a first build operation and a second build operation.

Abstract: A varying a composition of build material used for a three dimensional (3D) part formed by a 3D printer are disclosed. In a system provided, a number of vessels for build material are included, wherein each vessel includes a feeder coupled to a conveying system. The conveying system conveys and blends build material from the vessels. A controller is configured to adjust a composition of the build material by adjusting an amount of material added from each of the vessels by controlling the feeder on each of the vessels.

Abstract: Techniques for controlling moisture content of build material in a three-dimensional printer are provided. The system includes a vessel to supply the build material into a build material conveying system. The vessel includes an air inlet to receive a flow of air to fluidize the build material. The system also includes an air conditioner to control the humidity of the air and provide a controlled level of moisture content to the build material.

Abstract: In one example, a pneumatic transport system to transport build material in an additive manufacturing machine includes a conduit, a source of air pressure to pull or push a stream of air through the conduit, a source of build material to introduce a build material into the stream of air, a separator to remove build material from the stream of air, a flow meter downstream from the separator to measure the stream of air flowing through the conduit, and a controller operatively connected to the flow meter and to the source of air pressure and/or the sources of build material to, based on a measurement from the flow meter, adjust a rate of flow of the stream of air in the conduit.

Abstract: According to examples, an apparatus may include a controller to identify a property of particulate material contained in a container and to determine, based upon the identified property of the particulate material, a parameter of a supply of gas fed into a conditioning assembly to condition the particulate material contained in the container. The controller may further control a mechanism to supply the gas at the determined parameter into the conditioning assembly.

Abstract: According to examples, an apparatus may include a hopper having side walls, a bed positioned within the side walls, and a porous membrane supported above the bed. The porous membrane may have a plurality of pores having sizes that are between about 5 microns and about 15 microns and having a density of about 10 and about 30 percent of a material forming the porous membrane. A space between the bed and the porous membrane is to be pressurized with a gas and the gas is to flow through the porous membrane to fluidize particulate material provided on the porous membrane. The apparatus may also include a drain opening extending through the porous membrane and a drain aperture extending through the bed.

Abstract: In some examples, a method includes applying a negative pressure to a gas-filled volume through a vent. While a pressure in the volume decreases, the method draws a gas out through the vent and moves a liquid into the volume. The volume is filled with the liquid so that one side of the vent is covered with the liquid and the pressure in the volume increases up to a specified point.

Abstract: A print system or a method to apply a negative pressure to a substantially dry volume through at least one vent.

Abstract: An inkjet material dispenser system includes a printhead member. According to one exemplary embodiment, the printhead member includes at least one drop ejector including an insulating stack layer and a top orifice surface defining an orifice, wherein a ratio of a diameter of the orifice to a height of the insulating stack layer (O/L ratio) is at least 1.0.

Abstract: An inkjet material dispenser system includes a printhead member. According to one exemplary embodiment, the printhead member includes at least one drop ejector including an insulating stack layer and a top orifice surface defining an orifice, wherein a ratio of a diameter of the orifice to a height of the insulating stack layer (O/L ratio) is at least 1.0.

Abstract: In one example, a land based seismic sensing device includes: a seismic sensing unit having a seismic sensor in a housing configured to be buried in the ground; a control unit including a battery in a weather resistant housing configured to be exposed above ground; and a flexible cable mechanically and electrically connecting the seismic sensing unit and the control unit. The cable includes a weather resistant jacket and an electrically conductive element inside the jacket detachably connected between electronic circuitry in the sensing unit and electronic circuitry in the control unit. In one example, the control unit housing includes a first compartment configured to stow the seismic sensing unit and a second compartment configured to stow the cable.

Abstract: Inkjet print head dies are directly seated upon an exterior of a tubular member so as to face different directions.

Abstract: A fuel cartridge includes a fuel containing substance and a heater in thermal communication with the fuel containing substance.

Abstract: A volumetric fluid dispensing device can include a fluid reservoir having at least one flexible wall and a dispensing reservoir oriented above the fluid reservoir. The dispensing reservoir can have an overflow return fluidly connected to the fluid reservoir such that the dispensing reservoir holds a measured volume of fluid. A reservoir conduit can be fluidly connected to the fluid reservoir and the dispensing reservoir to allow excess fluid to return from the overflow to the fluid reservoir. A dispensing conduit can also be fluidly connected to the dispensing reservoir to allow fluid to exit the dispensing reservoir. A mechanical wall actuator can be operatively associated with the walls for controllably flexing at least a portion of the walls sufficient to force fluid from the fluid reservoir to the dispensing reservoir via the reservoir conduit.

Abstract: The present invention is directed to an integrated cartridge assembly for delivery of the biocompatible fluids to a subject, in which the device comprises an integrated cartridge including a fluid reservoir for housing the biocompatible fluid, a dispenser permanently and fluidically connected to the fluid reservoir, and configured for dispensing the biocompatible fluid to a manifold which is fluidically and removably connectable to the cartridge.