Abstract: A build material dispensing device may include a material spreader to spread an amount of build material along a build platform, and at least one hopper for dispensing the build material. The at least one hopper dispenses a plurality of doses of the build material in front of the progression of the material spreader as the material spreader is moved over the build platform.

Abstract: According to one aspect, there is provided apparatus for forming a layer of build material for three-dimensional printing. The apparatus comprises a spreader to spread a volume of build material to form a layer of build material on a build platform, wherein at least one end of the spreader is to remain a constant distance from a build material retaining wall in proximity to at least one edge of the build platform as the spreader is moved over the surface of the build platform, and further wherein at least a portion of the spreader is below the top of the retaining wall.

Abstract: According to examples, an apparatus may include a processor and a memory on which are stored machine-readable instructions that when executed by the processor, may cause the processor to access data corresponding to a 3D object model, in which the data may identify a label placeholder on the 3D object model. The processor may also access fabrication information pertaining to a 3D object to be fabricated based on the data, generate a defined label based on the accessed fabrication information, and may insert the defined label at the label placeholder on the 3D object model, such that the 3D object may be fabricated with the defined label positioned at a location on the 3D object corresponding to the label placeholder on the 3D object model.

Abstract: A build material dispensing device may include a material spreader to spread an amount of build material along a build platform, and at least one hopper for dispensing the build material. The at least one hopper dispenses a plurality of doses of the build material in front of the progression of the material spreader as the material spreader is moved over the build platform.

Abstract: A build material dispensing device may include a material spreader to spread an amount of build material along a build platform, and at least one hopper for dispensing the build material. The at least one hopper dispenses a plurality of doses of the build material in front of the progression of the material spreader as the material spreader is moved over the build platform.

Abstract: According to one example, there is provided a method of generating three-dimensional objects in a three-dimensional printing system comprising a pair of movable build modules. The method comprises moving a first build module into a build position, executing a 3D print job in the first build module, moving the first build module into a post-build position, performing post-processing operations on the first build module, moving a second build module into the build position, and executing a 3D print job in the second build module.

Abstract: According to one aspect, there is provided apparatus for forming a layer of build material for three-dimensional printing. The apparatus comprises a spreader to spread a volume of build material to form a layer of build material on a build platform, wherein at least one end of the spreader is to remain a constant distance from a build material retaining wall in proximity to at least one edge of the build platform as the spreader is moved over the surface of the build platform, and further wherein at least a portion of the spreader is below the top of the retaining wall.

Abstract: In one example, a refill control system to control the flow of powdered build material to a dispenser to periodically refill the dispenser with powdered build material. In one example, the refill control system includes a container to hold powered build material and a valve operable between a closed position to block a flow of powdered build material from the container to the dispenser and an open position to not block the flow of powdered build material from the container to the dispenser. The container is movable from a first position to a second position to connect the container to the dispenser and from the second position to the first position to disconnect the container from the dispenser.

Abstract: A three-dimensional (3D) printer and method including a vessel to discharge build material for the 3D printer to form a 3D object from the build material. The vessel includes a baffle or restrictor to alter flow of build material discharging from the vessel.

Abstract: Printers and associated printer maintenance methods and apparatus are disclosed. A printer including a work area; a temperature sensor to measure a first temperature value at a first region of the work area and a second temperature value at a second region of the work area; and a recoater to distribute a first amount of build material onto the first region and a second amount of the build material onto the second region in response to the first temperature value being a threshold different than the second temperature value.

Abstract: According to one example, there is provided a method of generating three-dimensional objects in a three-dimensional printing system comprising a pair of movable build modules. The method comprises moving a first build module into a build position, executing a 3D print job in the first build module, moving the first build module into a post-build position, performing post-processing operations on the first build module, moving a second build module into the build position, and executing a 3D print job in the second build module.

Abstract: In some examples, a controller is to receive a measurement from a sensor in an enclosure, and use the measurement and a baseline value to represent a condition of an airflow flowing through a filter that removes particulates from an incoming airflow into the enclosure. Based on the measurement and the baseline value, the controller is to selectively adjust a setting of an airflow generator that causes the incoming airflow through an inlet into the enclosure, or indicate that the filter is to be replaced.

Abstract: A build material dispensing device may include a material spreader to spread an amount of build material along a build platform, and at least one hopper for dispensing the build material. The at least one hopper dispenses a plurality of doses of the build material in front of the progression of the material spreader as the material spreader is moved over the build platform.

Abstract: According to one example, there is provided an apparatus comprising a supply station to receive a container, and a controller to determine when a build material container is present in the supply station and to cause the supply station to rotate the build material container to transfer build material between the build material container and a build material store, and determine when a post-processing container is inserted into the supply station and to cause the post-processing container to rotate to perform a post-processing operation on a three-dimensionally printed object in the post-processing container.

Abstract: An additive manufacturing apparatus or method may include an irradiation structure, an irradiation filter to filter at least a part of the radiation, to transmit a narrower wavelength range than the received wavelength range to the media.

Abstract: In example implementations, an apparatus and method are provided. The apparatus includes a movable carriage, an energy source coupled to the movable carriage and a plurality of shutters coupled to the movable carriage. In one example, the plurality of shutters is coupled to the movable carriage along a length of the energy source. Each one of the plurality of shutters may be coupled to the movable carriage via respective coupling mechanism that provides a continuously variable movement of each one of the plurality of shutters.

Abstract: A printing system includes a printhead to eject ink onto a print medium in a print zone. A first roller pair is adjacent to the print zone to advance a print medium into the print zone. A second roller pair upstream from the first roller pair, and driven by an independent motor, advances the print medium to the first roller pair in a position control mode. A controller causes the second roller pair to switch from the position control mode to a force control mode when a leading edge of the print medium reaches the first roller pair. The second roller pair applies a substantially constant force to the print medium in the force control mode to push the leading edge of the print medium against the first roller pair while the first roller pair is stationary.

Abstract: Examples include an indication of whether a print job is a cut media or continuous media print job. Examples include acquisition of information indicating whether a print job to be printed on a printing device is a cut media print job or a continuous media print job, and determination of when reflected intensity of output light reflected within the printing device has crossed a detection threshold.

Abstract: A printer system includes a handling system to move print media, a print medium detection sensor to produce a response indicative of an object, and a processor coupled to the handling system and to the print medium detection sensor to perform a two-point calibration of the sensor. The first point of the two-point calibration includes a first response from the sensor, and a second point of the two-point calibration includes a second response from the sensor.

Abstract: A printing system includes a printhead to eject ink onto a print medium in a print zone. A first roller pair is adjacent to the print zone to advance a print medium into the print zone. A second roller pair upstream from the first roller pair, and driven by an independent motor, advances the print medium to the first roller pair in a position control mode. A controller causes the second roller pair to switch from the position control mode to a force control mode when a leading edge of the print medium reaches the first roller pair. The second roller pair applies a substantially constant force to the print medium in the force control mode to push the leading edge of the print medium against the first roller pair while the first roller pair is stationary.