Abstract: This disclosure describes 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 radiation absorber can absorb radiation energy and convert the radiation energy to heat. The first reactive agent can include water and a dissolved first pigment reactant. The second reactive agent can include water and a dissolved second pigment reactant. The second pigment reactant can be reactive with the first pigment reactant to form a water-insoluble pigment.

Abstract: The present disclosure describes 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 hydrophobizing agent, and a hydrophilizing agent. The fusing agent can include water and an electromagnetic radiation absorber, wherein the electromagnetic radiation absorber absorbs radiation energy and converts the radiation energy to heat. The hydrophobizing agent can include water and a hydrophobic additive including a first polymer having a hydrophobic group, a monomer that is polymerizable to form a first polymer having a hydrophobic group, or a combination thereof. The hydrophilizing agent can include water and a hydrophilic additive including a second polymer having a hydrophilic group.

Abstract: A multi-fluid kits for three-dimensional printing can include a fusing agent and a tinted anti-coalescing agent. The fusing agent can include water and an electromagnetic radiation absorber that absorbs radiation energy and converts the radiation energy to heat. The tinted anti-coalescing agent can include an aqueous liquid vehicle, a colored dye dissolved in the aqueous liquid vehicle, and a polyelectrolyte. The polyelectrolyte can have a weight average molecular weight from about 1,000 Mw to about 8,000 Mw, the polyelectrolyte can be water-absorbent at a water to polyelectrolyte weight ratio from about 2:1 to about 1,000:1, and about 90 wt % to 100 wt % of the polyelectrolyte can be dissolved in the aqueous liquid vehicle.

Abstract: This disclosure describes three-dimensional printing kits, methods of making three-dimensional printed objects, and systems for three-dimensional printing. In one example, a three-dimensional printing kit 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 particles and a redox-active inorganic salt mixed with the polymer particles. The fusing agent can include water and an electromagnetic radiation absorber, wherein the electromagnetic radiation absorber absorbs electromagnetic radiation energy and converts the electromagnetic radiation energy to heat.

Abstract: This disclosure describes three-dimensional printing kits, methods, and systems for three-dimensional printing with phosphorescent pigments. In one example, a three-dimensional printing kit can include a powder bed material and a low-tint fusing agent. The powder bed material can include polymer particles and phosphorescent pigment particles mixed with the polymer particles. The low-tint fusing agent can include water and an electromagnetic radiation absorber. The electromagnetic radiation absorber can absorb radiation energy and convert the absorbed radiation energy to heat.

Abstract: A three-dimensional printing kit 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 particles and a thermochromic additive. The thermochromic additive can be chemically stable at a melting point temperature of the polymer particles, and the thermochromic additive can exhibit a color change at a color transition temperature that is below the melting point of the polymer particles. The fusing agent can include water and a radiation absorber to absorb radiation energy and convert the radiation energy to heat.

Abstract: According to examples described herein, methods, compositions, and parts comprising an antistatic agent are described. According to one example, a method of three-dimensional printing can comprise: (i) a layer of build material being deposited; (ii) a first fusing agent being selectively applied on the build material, wherein the first fusing agent can comprise at least one first antistatic agent; and (iii) repetition of (i) and (ii) at least once to form a core of a three-dimensional part.

Abstract: In an example of a method for three-dimensional (3D) printing, a polymeric build material is applied to form a build material layer. A fusing agent is selectively applied, based on a 3D object model, onto the build material layer to form a patterned portion. A hydrophilic agent is selectively applied, based on the 3D object model, onto at least a portion of the patterned portion. The hydrophilic agent includes from 1 wt % to 12 wt % of a hydrophilic polymer dissolved in an aqueous liquid vehicle, wherein the hydrophilic polymer has a molar mass ranging from 1000 g/mol to 12,000 g/mol and is water-absorbent at a water to hydrophilic polymer weight ratio from 2:1 to 1000:1. The build material layer is exposed to energy to selectively coalesce the patterned portion and form a 3D object layer having a hydrophilic portion.

Abstract: A multi-fluid kit for three-dimensional printing can include a fusing agent comprising water and a radiation absorber, wherein the radiation absorber absorbs radiation energy and converts the radiation energy to heat. The multi-fluid kit can also include a detailing agent including an aqueous liquid vehicle and from about 1 wt % to about 12 wt % polyelectrolyte solubilized in the aqueous liquid vehicle at from about 90 wt % to 100 wt %. The polyelectrolyte can have a weight average molecular weight from about 1,000 Mw to about 12,000 Mw and can be water-absorbent at a water to polyelectrolyte weight ratio from about 2:1 to about 1,000:1.

Abstract: Disclosed herein are compositions for three-dimensional printing. In an example, disclosed herein is a composition for three-dimensional printing comprising: (A) a powder build material; (B) a first fusing agent; (C) a second fusing agent different from the first fusing agent; (D) a detailing agent; (E) a cyan ink composition; (F) a yellow ink composition; (G) a magenta ink composition; and (H) a black ink composition.

Abstract: According to examples described herein, methods, compositions, and agents comprising an antistatic agent are described. According to one example, a fusing agent composition for three-dimensional printing can comprise: at least one antistatic agent in an amount of from about 0.01 wt % to about 20 wt % based on a total weight of the fusing agent composition, at least one near infrared absorbing compound, at least one surfactant, at least one organic solvent, and water.

Abstract: According to examples described herein, methods, compositions, and parts comprising an antistatic agent are described. According to one example, a method of three-dimensional printing can comprise: (i) a layer of build material being deposited; (ii) a first fusing agent being selectively applied on the build material, wherein the first fusing agent can comprise at least one first antistatic agent; and (iii) repetition of (i) and (ii) at least once to form a core of a three-dimensional part.

Abstract: Disclosed herein are methods for three-dimensional printing. In an example, disclosed herein is a method for three-dimensional printing comprising: (A) depositing a layer of build material; and then carrying out at least one of the following: (B) selectively applying: a cyan ink composition, a yellow ink composition, a magenta ink composition, and/or a black ink composition on the build material; (C) selectively applying a first fusing agent on the build material, wherein the first fusing agent comprises at least one nanoparticle, wherein the nanoparticle comprises at least one metal oxide shown in formula (1): MmM?On (1); (D) selectively applying a second fusing agent on the build material, wherein the second fusing agent comprises at least one near infrared absorbing compound; (E) repeating (A) and at least one of (B), (C), and (D) at least once to form a three-dimensional part.