Abstract: In some examples, a system receives measurement data obtained based on a non-destructive imaging of an identifiable structure within a three-dimensional (3D) object formed using an additive manufacturing machine, the identifiable structure formed based on control of a characteristic of a build material of a first internal object portion relative to a characteristic of the build material in a second internal object portion, the first and second internal object portions being within the 3D object. The system determines, based on the measurement data, a deviation of a physical property of the identifiable structure from a target physical property, and outputs information indicating the deviation.

Abstract: In one example in accordance with the present disclosure, an additive manufacturing system is described. The additive manufacturing system includes an additive manufacturing device to form 1) a three-dimensional (3D) printed object and a container structure to form part of the 3D printed object. The container structure expels a payload when a predetermined condition is met. The additive manufacturing system also includes a payload distributor to place the payload in the container structure. A controller of the additive manufacturing system controls formation of the 3D printed object and the container structure.

Abstract: In one example in accordance with the present disclosure, an additive manufacturing system is described. The additive manufacturing system includes an additive manufacturing device to form a three-dimensional (3D) printed object. The additive manufacturing system also includes a placement device to embed at least a portion of a container structure into the 3D printed object. The container structure expels a payload when a predetermined condition is met. A controller of the additive manufacturing system controls additive manufacturing and placement of the portion of the container structure.