Method for manufacturing three-dimensional structure, and 3D printer filament

A 3D printer filament comprising a commingled yarn that contains a continuous reinforcing fiber (A) and a continuous thermoplastic resin fiber (B), with a dispersity of the continuous reinforcing fiber (A) in the commingled yarn of 60 to 100%;

• wherein a component derived from a portion of the continuous thermoplastic resin fiber (B) has an impregnation rate in the continuous reinforcing fiber (A) of not less than 10% and less than 80%;
• the 3D printer filament further comprises a reinforcing member for the commingled yarn;
• the reinforcing member is a thermoplastic resin fiber (C) and a monofilament;
• and
• the thermoplastic resin fiber (C) has a moisture content of 0.17% to 2.0% and a diameter of 0.5 to 2.5 mm.