Printing head for 3D printer

Abstract

The invention relates to a print head (10) for a 3D printer (1), comprising: a feed zone (11) having a feed (12) for a starting material (21), the viscosity of which can be varied; a plasticizing zone (14) having a heating device (15) and an outlet (16) for a liquid phase (22) of the starting material (21); and a conveying device (30) for conveying the starting material (21) from the feed zone (11) into the plasticizing zone (14), the conveying device comprising a piston (31) which can be guided into the feed zone (11), the piston (31) having a first piston section (5) which faces the plasticizing zone (14) and has a guide surface (9), the piston (31) is guided in a slot (7) of the print head (10) via the guide surface (9), an axial extension (l2) of the guide surface (9) being greater than a maximum axial extension (l1) of the feed (12) to an open surface (8) of the slot (7), the first piston section (5) and the slot (7) of the print head (10) having a polygonal cross-section, and the axial extension (l2) of the guide surface (9) of the piston (31) is between 1.5 and 1.7 times of the maximum axial extension (l1) of the opening surface (8).

Images