Three-dimensional printing with polyolefin and metal or metal oxide build materials

A method of printing a three-dimensional printed object using a three-dimensional printing system, the method comprising:

• using a hardware controller of the three-dimensional printing system to generate a command to direct a build material applicator of the three-dimensional printing system to apply a layer of particulate build material to a powder bed of the three-dimensional printing system, wherein the particulate build material includes:
• polymer particles including a polyolefin and first nanoparticles compounded with the polyolefin such that the first nanoparticles are embedded within the polymer particles;
• and
• second nanoparticles dry blended with the polymer particles, wherein the first nanoparticles and the second nanoparticles comprise metal or metal oxide, and wherein the first nanoparticles and the second nanoparticles have a higher thermal conductivity than the polyolefin;
• using the hardware controller to generate a command to direct a fusing agent applicator of the three-dimensional printing system to selectively apply a fusing agent to the layer of the particulate build material based on a three-dimensional object model, wherein the fusing agent includes water and an electromagnetic radiation absorber, wherein the electromagnetic radiation absorber absorbs radiation and converts the radiation energy to heat;
• and
• using the hardware controller to generate a command to direct a radiant energy source of the three-dimensional printing system to expose the layer of particulate build material to radiation energy to selectively fuse the particulate build material in contact with the electromagnetic radiation absorber and form a three-dimensional printed object.