Three-dimensional printing with hydrophobizing and hydrophilizing agents

A three-dimensional printing kit, comprising:

• a powder bed material comprising polymer particles;
• a fusing agent to selectively apply to the powder bed material, the fusing agent comprising water and an electromagnetic radiation absorber, wherein the electromagnetic radiation absorber absorbs radiation energy and converts the radiation energy to heat;
• a hydrophobizing agent to selectively apply to the powder bed material, the hydrophobizing agent comprising water and a hydrophobic additive, wherein the hydrophobic additive is a trialkoxysilane monomer functionalized with a hydrophobic group;
• and
• a hydrophilizing agent to selectively apply to the powder bed material, the hydrophilizing agent comprising:
• a liquid vehicle comprising water and an additive comprising an organic co-solvent, a surfactant, a chelating agent, a biocide, an anti-kogation agent, a buffer, or a combination thereof;
• and
• a hydrophilic additive comprising a second polymer having a hydrophilic group.

A method of making a three-dimensional printed article, the method comprising:

• iteratively applying individual build material layers of polymer particles to a powder bed;
• based on a three-dimensional object model, selectively applying a fusing agent onto the individual build material layers, wherein the fusing agent comprises water and an electromagnetic radiation absorber;
• based on the three-dimensional object model, selectively applying a hydrophobizing agent onto the individual build material layers, wherein the hydrophobizing agent comprises water and a hydrophobic additive, wherein the hydrophobic additive is a trialkoxysilane monomer functionalized with a hydrophobic group;
• based on the three-dimensional object model, selectively applying a hydrophilizing agent onto the individual build material layers, wherein the hydrophilizing agent comprises:
• a liquid vehicle comprising water and an additive comprising an organic co-solvent, a surfactant, a chelating agent, a biocide, an anti-kogation agent, a buffer, or a combination thereof;
• and
• a hydrophilic additive comprising a second polymer having a hydrophilic group;
• and
• exposing the powder bed to energy to selectively fuse the polymer particles in contact with the electromagnetic radiation absorber to form a fused polymer matrix at the individual build material layers.