Patent ID: 7867431

Claim:
A method of making an intended three-dimensional object of manufacture by irradiating a predetermined position of a first powdery layer to form a first sintered layer, irradiating a predetermined position of a second powdery layer, supplied onto the first sintered layer, to form a second sintered layer, and mechanically processing a surface of the sintered layers so formed, said method comprising: measuring, prior to molding, an initial position of at least one movable reference mark provided in the vicinity of the object using a first position measurer and the initial position of the movable reference mark using a second position measurer provided in a processor; measuring, during molding, a position of the movable reference mark and a position of the movable reference mark using the first position measurer and the second position measurer, respectively; and correcting an optical beam irradiating position of an optical beam and a processing position of the processor using the initial position of the movable reference mark prior to molding and the positions of the movable reference mark measured by the first and second position measurer during the course of molding.