Abstract: A system includes a controller to receive data corresponding to an object or slices of the object to be generated by a 3D printer, wherein the 3D printer includes an array of printhead nozzles to selectively eject a print agent on a layer of build material in a build chamber having a build chamber wall, the array of printhead nozzles spanning substantially the full width of the build chamber and moveable along a length of the build chamber. The controller to generate first print data used to generate layers of the object based on the received object data, and to generate second print data used to generate layers of a sacrificial barrier located between the object and the build chamber wall, the second print data is generated such that different parts of the sacrificial barrier are generated using a different plurality of nozzles of the array of printhead nozzles.

Abstract: In an example, a method includes identifying, by processing circuitry, a feature of less than a threshold size of an object to be generated in additive manufacturing. In some examples the method further includes determining, by processing circuitry, a first density of a print agent to be applied to build material when generating the identified feature of the object based on an intended flexibility of the feature of the object. The method may further include determining, by processing circuitry, a second density of print agent to be applied to build material when generating another feature of the object.

Abstract: A computing device comprising a controller is disclosed herein. The controller is to receive a virtual build volume defining an arrangement of a 3D object model to be used by a 3D printer to generate a 3D object; identify a portion of a surface of the to be generated 3D object that is expected to exhibit at least one of a set of surface quality defects; and modify the 3D object model by applying at least one texture pattern to a portion of the 3D object model corresponding to the identified portion, the texture pattern to be selected based on the expected at least one surface quality defect, to cause a 3D geometrical modification of the portion that is to at least partially mask the expected surface quality defect of a 3D object generated using the modified 3D object model.

Abstract: A computing device comprising a controller is disclosed herein. The controller is to receive an arrangement of a 3D object a virtual build volume to be generated by a 3D printer; determine an indication of the expected warpage of a portion of the 3D object; and modify the virtual build volume to add at least one anchor structure connected to the portion of the 3D object if the expected warpage is above a predeterminable threshold.

Abstract: A 3D printer is controlled to apply a print agent at a plurality of predetermined locations in a build chamber of the 3D printer, and energy is applied to heat the build chamber. A thermal image of the build chamber is received. Based on the thermal image, an error in application of the print agent in the build chamber is determined.

Abstract: In some examples, a system receives information that represents a value of a physical property of a three-dimensional (3D) object as a function of a location of the 3D object built by an additive manufacturing machine. The system generates, based on the received information, a map that includes adjustment values corresponding to different locations of a layer of build material, the adjustment values when applied by the additive manufacturing machine to modify data representing a further 3D object to be built by the additive manufacturing machine.

Abstract: A non-transitory machine-readable storage medium is encoded with instructions executable by a processor. The machine-readable storage medium includes instructions to modify data representing a three-dimensional object model, the three-dimensional object model for use in generating a three-dimensional object in a build chamber. The data is modified to include a container to substantially encapsulate contents of the build chamber comprising the three-dimensional object and non-solidified build material. A wall of the container comprises heat transfer control elements to control dissipation of heat from the contents of the container.

Abstract: A system includes a controller to receive data corresponding to an object or slices of the object to be generated by a 3D printer, wherein the 3D printer includes an array of printhead nozzles to selectively eject a print agent on a layer of build material in a build chamber having a build chamber wall, the array of printhead nozzles spanning substantially the full width of the build chamber and moveable along a length of the build chamber. The controller to generate first print data used to generate layers of the object based on the received object data, and to generate second print data used to generate layers of a sacrificial barrier located between the object and the build chamber wall, the second print data is generated such that different parts of the sacrificial barrier are generated using a different plurality of nozzles of the array of printhead nozzles.