Abstract: A fiber-reinforced resin strand used as a manufacturing material for a 3D printer, the fiber-reinforced resin strand containing: a base material containing a thermoplastic resin; and at least one fiber or fiber bundle disposed in the base material and extending in a strand-axial direction. Twisting is applied to the fiber or the fiber bundle along the strand-axial direction, and the number of times of the twisting per 1 m in length of the fiber-reinforced resin strand in the strand-axial direction is 30 or more and 80 or less.

Abstract: A strand production apparatus configured to produce a fiber reinforced resin strand having one or a plurality of fiber bundles including reinforcing fibers includes a twisting unit, a resin bath unit, and a winding unit. The twisting unit rotates the one or the plurality of fiber bundles around an axis of the one or the plurality of fiber bundles to form one or a plurality of twisted fiber bundles. In the resin bath unit, the one or the plurality of twisted fiber bundles are impregnated with a molten resin to form a fiber reinforced resin strand. The winding unit winds the fiber reinforced resin strand. The twisting unit is disposed on an upstream side of the resin bath unit in a conveying direction of the one or the plurality of fiber bundles.