Abstract: A 3D printing kit can include a powder bed material comprising from about 80 wt % to 100 wt % polymer particles, a fusing agent to selectively apply to the powder bed material, and a hardener to selectively apply to the powder bed material. The polymeric particles can include a polyalkylene backbone with both ethylene and propylene polymerized monomeric units with from 2 mol % to 15 mol % of the polymerized monomeric units include a grafted side chain having an epoxide moiety. The fusing agent can include water and a radiation absorber that absorbs electromagnetic energy and converts the electromagnetic energy to heat. The hardener can be present in the fusing agent or can be included in a hardening agent that is separate from the fusing agent.

Abstract: A particulate build material for three-dimensional printing can include from about 80 wt % to 100 wt % polymer particles having an average particle size from about 10 ?m to about 125 ?m. The polymer particles can have a polyolefin polymer backbone with from about 90 mol % to 100 mol % polypropylene polymeric units and from 0 mol % to about 10 mol % polyethylene polymeric units. The polymer particles can further include a crosslinkable component in the form of a maleic anhydride-containing side chain appended to the polyolefin polymer backbone, a thiol-containing side chain appended to the polyolefin polymer backbone, a glycidyl polyhedral oligomeric silsesquioxane compounded with the polyolefin polymer backbone, or a combination thereof.

Abstract: The present disclosure describes methods and systems for making three-dimensional printed objects. In one example, a method of making a three-dimensional printed object can include iteratively applying individual particulate build material layers to a powder bed. The particulate build material can include polymer particles that include a polyolefin and first nanoparticles compounded nanoparticles compounded with the polyolefin such that the first nanoparticles are embedded nanoparticles are embedded within the polymer particles. Second nanoparticles can be dry blended with the polymer particles. The first nanoparticles and second nanoparticles can include metal or metal oxide. The first and second nanoparticles can have a higher thermal conductivity that the polyolefin. A fusing agent including water and an electromagnetic radiation absorber can be selectively jetted onto the individual particulate build material layers.

Abstract: This disclosure describes compositions, kits, methods, systems, and three-dimensional parts. According to an example, described herein is a polymeric powder build material comprising a thermoplastic polymer powder composition, wherein the thermoplastic polymer powder composition comprises a polypropylene block copolymer made from a polymerizing propylene and ethylene or butylene or 1-pentene or 1-hexene or 1-octene or 4-methyl-1-pentene and polypropylene homopolymers.

Abstract: This disclosure describes compositions, kits, methods, systems, and three-dimensional parts. According to an example, described herein is a three-dimensional printed part made from three-dimensional printing, the three-dimensional part comprising: a thermoplastic polymer powder composition comprising a mixture of two or more polyolefins including at least 60 wt % of a C3 polyolefin based on the total weight of the mixture of the two or more polyolefins, wherein the thermoplastic polymer powder composition has a processing window of from about 120° C. to about 150° C.

Abstract: The present disclosure relates to a build material for 3D printing. The build material comprises polymeric particles comprising polypropylene and at least one elastomer. The polymeric particles comprise a surface-active coating.

Abstract: This disclosure describes compositions, kits, methods, systems, and three-dimensional parts. According to an example, described herein is a polymeric powder build material comprising a thermoplastic polymer powder composition, wherein the thermoplastic polymer powder composition comprises a polypropylene block copolymer made from a polymerizing propylene and ethylene or butylene or 1-pentene or 1-hexene or 1-octene or 4-methyl-1-pentene and polypropylene homopolymers.

Abstract: This disclosure describes compositions, kits, methods, systems, and three-dimensional parts. According to an example, described herein is a method of forming a polymeric powder build material composition for three-dimensional printing, the method comprising mixing a thermoplastic polymer powder composition, antioxidants, flow aids, a surface modifying agent, antistatic agents, and filler.

Abstract: A 3D printing kit can include a powder bed material comprising from about 80 wt % to 100 wt % polymer particles, a fusing agent to selectively apply to the powder bed material, and a hardener to selectively apply to the powder bed material. The polymeric particles can include a polyalkylene backbone with both ethylene and propylene polymerized monomeric units with from 2 mol % to 15 mol % of the polymerized monomeric units include a grafted side chain having an epoxide moiety. The fusing agent can include water and a radiation absorber that absorbs electromagnetic energy and converts the electromagnetic energy to heat. The hardener can be present in the fusing agent or can be included in a hardening agent that is separate from the fusing agent.

Abstract: This disclosure describes compositions, kits, methods, systems, and three-dimensional parts. According to an example, described herein is a three-dimensional printed part made from three-dimensional printing, the three-dimensional part comprising: a thermoplastic polymer powder composition comprising a mixture of two or more polyolefins including at least 60 wt % of a C3 polyolefin based on the total weight of the mixture of the two or more polyolefins, wherein the thermoplastic polymer powder composition has a processing window of from about 120° C. to about 150° C.

Abstract: This disclosure describes compositions, kits, methods, systems, and three-dimensional parts. According to an example, described herein is a threedimensional printing composition comprising: a polymeric powder build material comprising a thermoplastic polymer powder composition, wherein the thermoplastic polymer powder composition comprises: (a) at least 50 wt % of a C3 polyolefin, or a mixture of two or more polyolefins including at least 60 wt % of a C3 polyolefin based on the total weight of the mixture of the two or more polyolefins, (b) 0.1 to 1 wt % antioxidants, (c) 0.1 to 5 wt % flow aids, (d) 0-10 wt % of a surface modifying agent, (e) 0.05-wt %-10 wt % antistatic agents, (f) 2 wt % to 40 wt % filler, wherein the total of (a) to (f) is 100 wt %.

Abstract: The present disclosure relates to a build material for 3D printing. The build material comprises polymeric particles comprising polypropylene and at least one elastomer. The polymeric particles comprise a surface-active coating.

Abstract: This disclosure describes compositions, kits, methods, systems, and three-dimensional parts. According to an example, described herein is a method of forming a polymeric powder build material composition for three-dimensional printing, the method comprising mixing a thermoplastic polymer powder composition, antioxidants, flow aids, a surface modifying agent, antistatic agents, and filler.

Abstract: This disclosure describes compositions, kits, methods, systems, and three-dimensional parts. According to an example, described herein is a threedimensional printing composition comprising: a polymeric powder build material comprising a thermoplastic polymer powder composition, wherein the thermoplastic polymer powder composition comprises: (a) at least 50 wt % of a C3 polyolefin, or a mixture of two or more polyolefins including at least 60 wt % of a C3 polyolefin based on the total weight of the mixture of the two or more polyolefins, (b) 0.1 to 1 wt % antioxidants, (c) 0.1 to 5 wt % flow aids, (d) 0-10 wt % of a surface modifying agent, (e) 0.05-wt %-10 wt % antistatic agents, (f) 2 wt % to 40 wt % filler, wherein the total of (a) to (f) is 100 wt %.

Abstract: Compounded copolyamide powders, processes for preparation of compounded copolyamide powders, articles made therefrom and uses.

Abstract: A composition including particles of a carrier having on a surface thereof a compound according to structure (A) wherein either m is 1 and R is according to structure (B) in which n is an integer from 3 to 7, or m is 2 and R is according to structure C in which p is an integer from 1 to 10. Such compositions are useful for a variety of applications, for example the preparation of mortars and cements.

Abstract: A composition including particles of a carrier having on a surface thereof a compound according to structure (A) wherein either m is 1 and R is according to structure (B) in which n is an integer from 3 to 7, or m is 2 and R is according to structure C in which p is an integer from 1 to 10. Such compositions are useful for a variety of applications, for example the preparation of mortars and cements.