3D printing tool for machine tools

A method for additive manufacturing for forming a molded part, comprising:

• transmitting a force from a spindle of a machine tool via a gear to a conveyor element for advancing a filament and rotatable about an axis of rotation;
• receiving the lament by a material processing unit;
• conveying the filament in a direction of a delivery element with the material processing unit which comprises a combination gear having a gear train including a first gear wheel rotatable about the axis of rotation as a force-receiving element configured to receive an externally applied mechanical rotational force from the spindle, and a second gear wheel and a third gear wheel meshing with the first gear wheel and configured as force-delivery elements separately from the force-receiving element, with each of the second agar wheel and the third gear wheel connected separately via a respective worm shaft of a respective worm gear to a respective worm wheel as the conveyor element to deliver to the conveyor element the mechanical force transmitted purely mechanically from the force-receiving element, wherein the worm wheels are arranged in opposing relationship and operate as actively-driven pressure rollers to convey the filament;
• heating the filament in the delivery element;
• and delivering the heated filament.