1. A device for influencing the volume flow of extruded plastically deformable material, which is fed to an outlet die during the additive manufacturing of components, comprising a flange, which is arranged between an extrusion unit and an outlet die and connected to the extrusion unit and the outlet die, wherein a channel connects the extrusion unit to the outlet die a piston is mounted in the flange so as to rotate perpendicular to a longitudinal axis of the channel a borehole is formed in the piston in the region of the channel, the borehole connects to a bypass channel that runs through the piston to a bypass die; at least one groove is formed in a region of the channel on an outer lateral face of the piston, and the at least one groove is arranged in a different angular area than the borehole or is located around the borehole, so that the extruded plastically deformable material can be fed, depending on angular positions of the piston, through the at least one groove to the outlet die and simultaneously through the borehole and the bypass channel to the bypass die to influence the volume flow of the extruded plastically deformable material, or the extruded plastically deformable material solely is fed through the borehole and bypass channel to the bypass die and the expanded plastically deformable material which exits the bypass die is returned to the extrusion unit is stored.