A method for extruding thermomechanical deformable granular material for an additive production process by use of a device which is used in the additive production process and comprising a vertically arranged screw extruder of compact structural type having length/diameter ratio of from 1 to 10, wherein the screw extruder comprising an extruder screw, a filling device and a filling funnel, and the filling device comprising an end facing the extruder screw at which the filling device is connected to the filling funnel, such that the granular material is conveyed from the filling device into the filling funnel, wherein a comminution tool (5, 9, 10) is arranged radially in the filling funnel and in a filling region of the extruder screw, which tool (5, 9, 10) reduces the filling region for the extruder screw in the filling funnel, which tool (5, 9, 10) blocks a movement of the granular material in the circumferential direction and on which tool (5, 9, 10) the granular material is comminuted by rotating the extruder screw, wherein the comminution tool is formed - in the form of a pitch circle section of a cone, - in the form of a vertically extending wall, - in the form of vertically extending ribs or blades, or - in the form of a helical screw rotatable in the opposite direction to the extruder screw on an inner wall of the filling funnel, and wherein the comminution tool (5, 9, 10) comminutes the granular material supplied via the filling device in a mainly dust-like material, so that the settling dust fills, compacts and homogenizes intermediate spaces in the granular material, and in a subsequent shortened compression zone of the device, the compacted and homogenized material is molten and leaves the screw extruder from a shortened discharge zone for subsequent use in the additive production process. wherein the screw extruder comprising an extruder screw, a filling device and a filling funnel, and the filling device comprising an end facing the extruder screw at which the filling device is connected to the filling funnel, such that the granular material is conveyed from the filling device into the filling funnel, wherein a comminution tool (5, 9, 10) is arranged radially in the filling funnel and in a filling region of the extruder screw, which tool (5, 9, 10) reduces the filling region for the extruder screw in the filling funnel, which tool (5, 9, 10) blocks a movement of the granular material in the circumferential direction and on which tool (5, 9, 10) the granular material is comminuted by rotating the extruder screw, wherein the comminution tool is formed - in the form of a pitch circle section of a cone, - in the form of a vertically extending wall, - in the form of vertically extending ribs or blades, or - in the form of a helical screw rotatable in the opposite direction to the extruder screw on an inner wall of the filling funnel, and wherein the comminution tool (5, 9, 10) comminutes the granular material supplied via the filling device in a mainly dust-like material, so that the settling dust fills, compacts and homogenizes intermediate spaces in the granular material, and in a subsequent shortened compression zone of the device, the compacted and homogenized material is molten and leaves the screw extruder from a shortened discharge zone for subsequent use in the additive production process. - in the form of a pitch circle section of a cone, - in the form of a vertically extending wall, - in the form of vertically extending ribs or blades, or - in the form of a helical screw rotatable in the opposite direction to the extruder screw on an inner wall of the filling funnel,