Abstract: A build apparatus builds a first structural layer by irradiating a first beam position, builds a first build object and irradiating the first build object, a second irradiation beam position builds a second build object. The build apparatus further builds a second structural layer by irradiating the first structural layer, a third irradiation beam position builds a third build object and by irradiating the third build object, a fourth irradiation beam position builds a fourth build object. At least one of a distance between first and second position and a distance between third and fourth position is shorter than a distance between second and third position. Thus, the build apparatus builds a structural object including the first and second structural objects and is inclined with respect to an optical axis direction.

Abstract: A build system includes: a build apparatus including an energy beam irradiation unit, a material supply unit, and a control apparatus. The build system builds a second object above a first object including a first space. The second object includes: a first inclination part connected to the first object; a second inclination part connected to the first object; and a connection part that connects a tip of the first inclination part and a tip of the second inclination part. The build system builds the first inclination part and the second inclination part by alternately performing a building of a part of the first inclination part and a building of a part of the second inclination part. A second space below the first inclination part and the second inclination part is connected to the first space, and an upper part of the second space is closed by the connection part.