Abstract: In an example, a method includes operating, by a processor, on object model data. The object model data describes at least part of an object to be generated in additive manufacturing. The method also includes determining, by a processor, pattern data. The pattern data comprising areas of variable reflectance intended to be formed on a portion of the object. The method includes determining, by a processor, object generation instructions to apply a fusing agent to at least part of a layer of build material corresponding to the portion of the object in a density corresponding to the reflectance of the generated pattern data.

Abstract: In an example of a method for forming three-dimensional (3D) printed electronics, a build material is applied. A fusing agent is selectively applied on at least a portion of the build material. The build material is exposed to radiation and the portion of the build material in contact with the fusing agent fuses to form a layer. An electronic agent is selectively applied on at least a portion of the layer, which imparts an electronic property to the at least the portion of the layer.

Abstract: In one example, an additive manufacturing process includes: making an object slice by slice, including dispensing a first quantity of each of multiple liquid functional agents on to a layer of fusable build material and then irradiating the layer of build material; while making the object, identifying a deviant region in a slice; and dispensing a second quantity different from the first quantity of at least one of the functional agents into a location corresponding to the deviant region.

Abstract: According to an example, a three-dimensional (3D) printer may include a delivery device to deposit a light absorbing agent onto selected areas of a layer of build material particles, in which the light absorbing agent absorbs light having wavelengths that are around the ultraviolet wavelength range. The 3D printer may also include a light source to apply light onto the selectively deposited light absorbing agent and the layer of the build material particles, in which the light absorbing agent absorbs light around the ultraviolet wavelength range from the applied light and becomes heated to a temperature that causes the build material particles upon which the light absorbing agent has been deposited to melt and to fuse together following cessation of the application of the light.

Abstract: The present disclosure relates to a method of manufacturing a 3D printed object. The method comprises selectively applying a fusing agent onto powder bed material; and exposing at least part of the powder bed material to radiation to fuse at least part of the powder bed material to form a layer of the 3D printed object. The fusing agent and/or a detailing agent is selectively applied to the powder bed material in a predetermined arrangement to form a porous region in the 3D printed object. The 3D printed object is then treated with a modifying agent, such that the modifying agent at least partially penetrates the porous region of the 3D printed object.

Abstract: The present disclosure is drawn to multi-fluid kits for three-dimensional printing, three-dimensional printing kits, and methods of making three-dimensional printed articles. In one example, a multi-fluid kit for three-dimensional printing can include a fusing agent, a first reactive agent, and a second reactive agent. The fusing agent can include water and a radiation absorber. The first reactive agent can include a first liquid vehicle and an epoxy compound having multiple epoxide groups. The second reactive agent can include a second liquid vehicle and an amine compound having multiple amino groups.

Abstract: A three-dimensional printing system can include polymeric build material and jettable fluid(s). The polymeric build material can have an average particle size from 20 ?m to 150 ?m, a first melt viscosity, and a melting temperature from 75° C. to 350° C. In one example, the jettable fluid can include water, from 0.1 wt % to 10 wt % of electromagnetic radiation absorber, and from 10 wt % to 35 wt % of an organic solvent plasticizer. Contacting a first portion of a layer of the polymeric build material with the jettable fluid can provide an organic solvent plasticizer loading from 2 wt % to 10 wt % based on the polymeric build material content. The first melt viscosity of the polymeric build material at the first portion can be reduced and the melting temperature of the polymeric build material at the first portion can be decreased by 3° C. to 15° C.

Abstract: A 3D object is additively formed via arranging non-conductive material relative to a receiving surface. During additive formation of the 3D object, a conductive channel is formed as part of the 3D object. In some instances, non-destructive fracture sensing is performed via measurement of an electrical parameter of the conductive channel.

Abstract: A vacuum interrupter. The vacuum interrupter comprising at least one anode side contact blade, at least one cathode side contact blade, at least one anode side conducting rod, at least one a cathode side conducting rod, a shielding case and an outer magnet, wherein the shielding case covers the at least one anode side contact blade, the c at least one anode side contact blade, the at least one anode side conducting rod and at least one cathode side conducting rod; and the outer magnet covers the shielding case. According to the vacuum interrupter, the outer magnet is arranged to generate a fixed first longitudinal magnetic field in the interelectrode area of the at least one anode side contact blade and the at least one cathode side contact blade, contraction of arcs during current breaking can be alleviated, the arcs are in a diffusion state, and ablation of the contact in the arcing process is reduced, and breaking capacity of a vacuum circuit breaker is guaranteed.

Abstract: The present disclosure relates to a three-dimensional printing kit comprising: a powder bed material comprising polymer particles; a fusing agent comprising a radiation absorber and a liquid carrier; and a magnetic marking agent comprising magnetic nanoparticles, a humectant and a liquid carrier, wherein the concentration of magnetic nanoparticles is 5 to 70 weight % based on the total weight of the magnetic agent. The present disclosure also relates to a method of three-dimensional (3D) printing a 3D printed object. The method comprises: selectively applying a magnetic marking agent onto powder bed material, wherein the powder bed material comprises polymer particles, and wherein the magnetic marking agent comprises magnetic nanoparticles and a liquid carrier; selectively fusing the powder bed material, such that the magnetic nanoparticles are incorporated in the 3D printed object in a predetermined arrangement that forms a detectable marker in the 3D printed object.

Abstract: According to an example, a three-dimensional (3D) printer may include a delivery device to deposit a light absorbing agent onto selected areas of a layer of build material particles, in which the light absorbing agent absorbs light having wavelengths that are around the ultraviolet wavelength range. The 3D printer may also include a light source to apply light onto the selectively deposited light absorbing agent and the layer of the build material particles, in which the light absorbing agent absorbs light around the ultraviolet wavelength range from the applied light and becomes heated to a temperature that causes the build material particles upon which the light absorbing agent has been deposited to melt and to fuse together following cessation of the application of the light.

Abstract: In an example, a method includes receiving object model data describing at least a portion of an object to be generated by additive manufacturing. Object generation instructions for generating the object in its entirety may be derived based on the object model data. Where it is determined that the object model data comprises a data deficiency for deriving the object generation instructions, at least one attribute for the object may be inferred and object generation instructions may be derived based on the object model data and the inferred attribute.

Abstract: A device includes a carriage movable relative to a build pad along a bi-directional travel path and supporting at least a radiation source and an applicator to selectively apply a plurality of fluid agents, including first fluid agents to affect a first material property. A timing and order of operation of the radiation source and the applicator, with the carriage, is to maintain first and second portions of a 3D object under formation within at least one selectable temperature range despite a first total volume of the first fluid agents for application onto the first portion of the 3D object being substantially greater than a second total volume of second fluid agents for application onto the second portion of the 3D object.

Abstract: An example of a fusing agent includes a metal bis(dithiolene) salt, a polar aprotic solvent, and a balance of water. An example of a method for making an example of the fusing agent includes adding a metal bis(dithiolene) salt into a liquid vehicle including at least a polar aprotic solvent and water.

Abstract: In one example, a lighting device for an additive manufacturing machine includes first light sources each to emit monochromatic light within a first band of wavelengths that includes a peak light absorption of a liquid coalescing agent and second light sources each to emit monochromatic light within a second band of wavelengths different from the first band of wavelengths. Each of the first light sources or each of multiple groups of the first light sources is individually addressable to emit monochromatic light independent of any other of the first light sources or of any other group of the first light sources and each of the second light sources or each of multiple groups of the second light sources is individually addressable to emit monochromatic light independent of any other of the second light sources or of any other group of the second light sources.

Abstract: The present disclosure relates to a method of three-dimensional (3D) printing a 3D printed object. The method comprises: selectively jetting a marking agent onto a first region of build material, wherein the build material comprises at least one meta and/or ceramic; selectively jetting a binding agent onto at least a portion of the build material; and binding the build material to form a layer; such that the marking agent is incorporated in the metal part in a predetermined arrangement that forms a detectable marker in the 3D printed object. The disclosure also relates to a multi-fluid inkjet kit for 3D printing.

Abstract: Example post-print processing of three dimensional (3D) printed objects are disclosed. An example system includes an energy source to apply energy to a selected portion of an outer surface of a 3D printed object. The energy provided by the energy source is to cause a polymer of the selected portion to melt and reflow. The selected portion and a non-selected portion of the outer surface to form a pattern on the outer surface of the 3D printed object. A controller to direct the energy of the energy source to the selected portion of the outer surface.

Abstract: A three-dimensional printing kit can include a particulate build material, a binding agent, and a supportive coating agent. The particulate build material can include from about 80 wt % to about 100 wt % metal particles based on the total weight of the particulate build material. The binding agent can include binder particles dispersed in a binder liquid vehicle. The supportive coating agent can include ceramic particles having a negative coefficient of thermal expansion, a gelling compound, and a supportive coating liquid vehicle.

Abstract: A device includes a coater, a dispenser, and a treatment portion. The coater is to coat, layer-by-layer, a build material relative to a build pad to form a 3D object. The dispenser is to at least dispense a fluid including a first at least potentially electrically conductive material in at least some selected locations of an external surface of the 3D object. The treatment portion is to treat the 3D object to substantially increase electrically conductivity on the external surface of the 3D object at the at least some selected locations.

Abstract: In one example, a lighting device for an additive manufacturing machine includes an array of light sources each to emit monochromatic light within a band of wavelengths that includes a peak light absorption of a liquid coalescing agent to be dispensed on to a build material.