Extruder units, extruder systems and uses of extruder units and/or extruder systems

摘要

An extruder device (1) for extruding a strand (ST) of a construction material (BS) for 3D printing of a building part (BWT), this extruder device (1) of a construction material (BS) from the extruder device (1) an extruder nozzle (5) comprising a discharge opening (2) for discharging the strands (ST), and at least one cover element (8, 8a, 8b), comprising at least one cover element (8, 8a, 8b) ), in such a way that the opening cross section 3 of the at least one uncovered part 2b of the discharge opening 2 defines a strand cross section 4 of the discharged strand ST of the construction material BS. , so as to cover at least one portion 2a of the discharge opening 2 .