Method for manufacturing three-dimensionally shaped object, three-dimensionally shaped object obtained thereby, and method for manufacturing molded article

A method for manufacturing a three-dimensional shaped object, the method comprising repeatedly:

• forming a solidified layer by irradiating a predetermined portion of a powder layer with a light beam, thereby allowing a sintering of the powder in the predetermined portion or a melting and subsequent solidification thereof;
• and
• forming another solidified layer by newly forming a powder layer on the resulting solidified layer, followed by the irradiation of a predetermined portion of the powder layer with the light beam,
• wherein a part of a surface portion of the three-dimensional shaped object is formed as a low-density solidified portion whose solidified density ranges from 50% to 90% so that an application of pressure can be performed by a gas flowing through the low-density solidified portion;
• and the method further comprising:
• forming a hollow portion in the three-dimensional shaped object such that the hollow portion communicates with the low-density solidified portion;
• and
• forming, in a partial space of the hollow portion, a supporting solidified portion defined by a sintered portion, wherein the supporting solidified portion supports and is connected to the low-density solidified portion.