Abstract: In example implementations, a three-dimensional printing kit for printing a colorless three-dimensional object in a three-dimensional printing system is provided. The three-dimensional printing kit includes a build material and an ultraviolet (UV) fusing agent. The UV fusing agent includes water, a UV light absorber, about 10-50 weight percent (wt %) of a first solvent to provide a polymer plasticizer, and about 30-50 wt % a second solvent that is water miscible and dissolves the UV light absorber.

Abstract: An example of a three-dimensional (3D) printing energy absorbing composition includes carbon black particles present in an amount ranging from about 0.01 wt % active to about 3 wt % active, based on a total weight of the 3D printing energy absorbing composition; benzyl alcohol present in an amount ranging from about 1 wt % active to about 40 wt % active, based on the total weight of the 3D printing energy absorbing composition; a solvent for benzyl alcohol having a boiling point of 150 C or higher present in an amount ranging from about 20 wt % active to about 60 wt % active, based on the total weight of the 3D printing energy absorbing composition; and a balance of water.

Abstract: A kit for three-dimensional (3D) printing is described. The kit comprises a build material composition: a fusing agent composition including a radiation absorber present in an amount ranging from about 0.01 wt % to about 2.0 wt % of a total weight of the fusing agent composition, wherein the radiation absorber absorbs radiation at a wavelength range within the visible light spectrum; and a fusing assist composition including a first co-solvent; a second co-solvent; and a balance of water.

Abstract: Examples of a build material composition and a thermally conductive agent for three-dimensional printing are disclosed. An example of the build material composition includes from about 90 wt % to about 99 wt % of thermoplastic polyurethane particles and from about 1 wt % to about 10 wt % of a thermally conductive filler, based on a total weight of the build material composition. An example of the thermally conductive agent includes an aqueous vehicle and from about 1 wt % active to about 10 wt % active of the thermally conductive filler, based on a total weight of the thermally conductive agent. In both examples, the thermally conductive filler is selected from cubic boron nitride and diamond-like carbon.

Abstract: Examples of the present disclosure are directed toward fusing agent compositions. An example fusing agent composition includes a radiation absorber, a co-solvent mixture, and a balance of water. In various examples, the radiation absorber is present in an amount ranging from about 0.005 weight percent (wt %) to about 1.0 wt % of a total weight of the fusing agent composition, wherein the radiation absorber absorbs radiation at a wavelength range within the visible light spectrum.

Abstract: A three-dimensional printing kit includes a substantially colorless fusing agent and a color assist agent. The fusing agent includes a liquid vehicle including water, a co-solvent, and an amino acid stabilizer. The fusing agent further includes an infrared (IR) absorbing pigment dispersion including an IR absorbing pigment present in an amount ranging from about 0.01 wt % active to about 1.6 wt % active, based on a total weight of the fusing agent. The color assist agent includes a liquid vehicle including water and a plasticizing co-solvent, and a dye dissolved in the liquid vehicle. Also disclosed is a method of making a colored 3D printed object.

Abstract: Three-dimensionally printed parts are exposed to different processes enabling the parts or components thereof to be reused. In one example, a 3D printed part is exposed to an absorber extraction process, and the absorber extracted from the 3D printed part is used to form a second-generation fusing agent. In another example, a 3D printed part is divided into smaller pieces and injection molded to form a second-generation 3D object with unexpectedly high mechanical properties.

Abstract: A fusing agent for three-dimensional printing can include an aqueous liquid vehicle and an acriflavine dye dissolved in the aqueous liquid vehicle. The aqueous liquid vehicle can include water, organic co-solvent, and surfactant.

Abstract: Three-dimensional printing kits can include a powder bed material and a fusing agent to selectively apply to the powder bed material. The powder bed material can include polymer build particles and cellulose particles. The cellulose particles can be chemically and thermally stable at a melting point temperature of the polymer build particles. The fusing agent can include water and a radiation absorber to absorb radiation energy and convert the radiation energy to heat.

Abstract: A polyol stiffening additive in a powder bed material for three-dimensional (3D) printing is disclosed herein. In an example, the 3D powder bed material includes an elastomeric build material and a polyol stiffening additive having 3 to 7 carbon atoms that is about 2 weight percent to about 20 weight percent of a total weight of the 3D powder bed material.

Abstract: A fusing agent for three-dimensional printing can include from about 5 wt % to about 40 wt % water; from about 4 wt % to about 60 wt % C7 to C12 aliphatic ester cosolvent; and from about 0.5 wt % to about 10 wt % solubilized avobenzone.

Abstract: A particulate build material for three-dimensional printing can include from about 80 wt % to about 99.5 wt % of a polyamide particles, and from about 0.5 w % to about 7.5 wt % of thermally conductive particles including cubic lattice structured particles of carbon, cubic lattice structured particles of boron and nitrogen, or a combination thereof.

Abstract: A three-dimensional printing kit can include a build material with from about 80 wt % to 100 wt % polymeric particles having a D50 particle size from about 10 ?m to about 150 ?m, and a fusing agent including from about 0.5 wt % to about 20 wt % avobenzone particles dispersed in an aqueous liquid vehicle based on a total weight of the fusing agent.

Abstract: A three-dimensional printing kit can include a build material with from about 80 wt % to 100 wt % polymeric particles having a D50 particle size from about 10 ?m to about 150 ?m, and a fusing agent including from about 0.5 wt % to about 20 wt % avobenzone particles dispersed in an aqueous liquid vehicle based on a total weight of the fusing agent.

Abstract: In example implementations, a method is disclosed. The method includes dispensing a layer of an optically clear build material, dispensing a fusing agent onto a first portion of the layer of the optically clear build material, dispensing an invisible fluorescence compound on a second portion of the layer of the optically clear build material, and applying ultraviolet (UV) light to the layer to fuse the first portion and the second portion of the optically clear build material that received the fusing agent and the invisible fluorescence compound. The invisible fluorescence compound is to print an embedded feature in the layer that is invisible under a first light and visible under a second light.

Abstract: A fusing agent for three-dimensional printing can include from about 5 wt % to about 40 wt % water; from about 4 wt % to about 60 wt % C7 to C12 aliphatic ester cosolvent; and from about 0.5 wt % to about 10 wt % solubilized avobenzone.

Abstract: This disclosure describes a method of printing a 3D printed object. The method comprises: selectively applying a fusing agent onto a portion of a build material, wherein the fusing agent comprises a radiation-absorbing dye dissolved in an aqueous liquid carrier; exposing the selectively applied fusing agent to radiation to produce heat energy to fuse the portion of build material to form a layer of the 3D printed object; and thermally treating the 3D printed object at a temperature of above 70° C.

Abstract: In example implementations, a three-dimensional printing kit for printing a colorless three-dimensional object in a three-dimensional printing system is provided. The three-dimensional printing kit includes a build material and an aqueous ultraviolet (UV) fusing agent. The aqueous UV fusing agent includes water in greater than 50 weight percent of the aqueous UV fusing agent and a UV absorber cyclodextrin complex.

Abstract: In example implementations, a three-dimensional printing kit for printing a three-dimensional object in a three-dimensional printing system is provided. The three-dimensional printing kit includes a build material, a first colored fusing agent, and a second colored fusing agent. The first colored fusing agent includes water, a first solvent to provide a polymer plasticizer, a second solvent that is water miscible, a colored visible light absorber that absorbs a visible wavelength of light, wherein the colored visible light absorber comprises less than 3 weight percent of the first colored fusing agent, and a first colored dye. The second colored fusing agent includes water, the first solvent, the second solvent, the colored visible light absorber, and a second colored dye.

Abstract: In example implementations, a three-dimensional printing kit for printing a colorless three-dimensional object in a three-dimensional printing system is provided. The three-dimensional printing kit includes a build material and an ultraviolet (UV) fusing agent. The UV fusing agent includes water, a UV light absorber, about 10-50 weight percent (wt %) of a first solvent to provide a polymer plasticizer, and about 30-50 wt % a second solvent that is water miscible and dissolves the UV light absorber.