Print head for 3D printing of metals

A print head (1) for a 3D printer comprising a housing (3), a device (28) for supplying a metal (14), a piston (5), a reservoir (7, 27) having an outlet opening (10), and an actuator device (12) for driving the piston (5), the reservoir (7, 27) comprising a melting region (20) and a displacement space (21) for a liquid phase (8) of the metal (14), the melting region (20) being adjacent to an inert atmosphere (22) and connected to the displacement space (21) such that the liquid phase (8) of the metal (14) can pass through the outlet opening (10) by driving the piston (5), wherein the housing (3) is configured in a plurality of parts and comprises at least a cooling flange (25), an insulating plate (26) and the reservoir (7, 27),

• wherein
• the reservoir (7, 27) is connected to the cooling flange (25) and/or the insulating plate (26) by a centering device (50), wherein the centering device (50) comprises a flange (51), a clamping device (53) and a centering sleeve (55), wherein an active surface (52) connects the reservoir (7, 27) to the flange (51) of the centering device (50) such that the reservoir (7, 27) is concentrically aligned with respect to the cooling flange (25) and/or the insulating plate (26), and wherein the clamping device (53) connects the flange (51) of the centering device (50) to the cooling flange (25) and/or the insulating plate (26);
• wherein
• the centering sleeve (55) is arranged in the cooling flange (25) and/or the insulating plate (26) such that the centering sleeve (55) centrally aligns the piston (5) with respect to the reservoir (7, 27).