Anti-coalescing agent for three-dimensional printing

A method for three-dimensional (3D) printing, comprising:

• applying a polymeric or polymeric composite build material;
• negatively patterning some of the polymeric or polymeric composite build material to define a removable build material portion and a remaining build material portion, the negatively patterning including selectively applying an anti-coalescing agent comprising:
• a vehicle, comprising:
• a co-solvent;
• a surfactant;
• a humectant;
• and
• water;
• and
• an anti-coalescing polymer dispersed in the vehicle, the anti-coalescing polymer having a mean particle size ranging from about 50 nm to about 195 nm;
• and
• based on a 3D object model, forming a layer of a final 3D object from at least some of the remaining build material portion, wherein the some of the polymeric or polymeric composite build material in the removable build material portion remains non-coalesced.

A three-dimensional (3D) printed article, comprising:

• a fused polymer or polymer composite object;
• and
• a removable object in contact with at least a portion of the fused polymer or polymer composite object, the removable object comprising:
• unfused polymeric or polymeric composite build material particles;
• and
• a polymeric coating formed on surfaces of the unfused polymeric or polymeric composite build material particles and present in voids between the polymeric or polymeric composite build material particles, wherein the polymeric coating is a perfluorinated polymer.