A three-dimensional printing kit can include a polymeric build material and a fusing agent. The polymeric build material can include polymer particles having a D50 particle size from about 2 μm to about 150 μm. The fusing agent can include an aqueous liquid vehicle including water and an organic co-solvent, a radiation absorber to generate heat from absorbed electromagnetic radiation, and from about 2 wt % to about 15 wt % of a carbamide-containing compound.

A three-dimensional printing kit can include a polymeric build material and a fusing agent. The polymeric build material can include polymer particles having a D50 particle size from about 2 μm to about 150 μm. The fusing agent can include an aqueous liquid vehicle including water and an organic co-solvent, a radiation absorber to generate heat from absorbed electromagnetic radiation, and from about 2 wt % to about 15 wt % of a carbamide-containing compound.

[Problem]

To increase rigidity.

[Solution]

Provided is a structure including a main body portion, a plurality of reinforcement members arranged on the main body portion, each of the reinforcement members including a base material formed of resin or metal. Provided is a manufacturing method of a structure which includes a main body portion having a hollow configuration surrounding an internal space thereof. The manufacturing method includes a preparation step of preparing a plurality of reinforcement members each including at least a base material formed of resin or metal, a carrying-in step of carrying the plurality of reinforcement members into the internal space from an opening arranged at the main body portion, and a step of arranging a fixing portion which fixes the plurality of reinforcement members into the main body portion.

Compositions for reactive additive manufacturing using recycled components obtained from previously manufactured articles produced by additive manufacturing, as well as methods of making and using the compositions. The compositions may include a first reactive component and a second reactive component, the first and second reactive components reactive with each other, together with particles comprising a recycled, cured thermoset component, the particles present in an amount greater than 2 wt. % based on total weight of the composition, and a filler present in an amount from 1 to 10 wt. % based on a total weight of the composition.