Three-dimensional printing

A materials kit for 3D printing comprising:

• a powder bed material comprising thermoplastic polyurethane particles having an average particle size from about 20 μm to about 120 μm and a melting temperature of from about 100° C. to about 250° C., and wherein the thermoplastic polyurethane particles include polyurethane polymer strands having an average of about 10 wt % to about 30 wt % hard segments based on a total weight of the thermoplastic polyurethane particles, the hard segments including a symmetrical aliphatic diisocyanate and a symmetrical aliphatic chain extender that are polymerized into the thermoplastic polyurethane particles;
• and
• a fusing agent comprising a radiation absorber to selectively apply to the powder bed material;
• and
• a detailing agent comprising a detailing compound to selectively apply to the powder bed material.

A method of making a 3D printed article comprising:

• iteratively applying individual build material layers of thermoplastic polyurethane particles to a powder bed, the thermoplastic polyurethane particles having an average particle size from about 20 μm to about 120 μm and a melting temperature of from about 100° C. to about 250° C., and wherein the thermoplastic polyurethane particles include polyurethane polymer strands having an average of about 10 wt % to about 30 wt % hard segments based on a total weight of the thermoplastic polyurethane particles, the hard segments including a symmetrical aliphatic diisocyanate and a symmetrical aliphatic chain extender that are polymerized into the thermoplastic polyurethane particles;
• based on a 3D object model, selectively jetting a fusing agent onto individual build material layers, where the fusing agent comprises a radiation absorber;
• and
• exposing the powder bed to electromagnetic energy to selectively fuse the thermoplastic polyurethane particles in contact with the radiation absorber at individual build material layers to form a 3D printed article.