Printing heads for printing with cementitious material

A device for 3D printer for printing with cementitious material, comprising: a first tubular body (2) having a first end (2a) adapted for coupling to a first end (1 b) of an extrusion tubular member (1), the first tubular body (2) comprising a rolling bearing ring; a printing head (3) comprising: a second tubular body (13) coupled to a second end of the first tubular body (2); and an extrusion nozzle (15) for discharging the cementitious material, the extrusion nozzle (15) being coupled to the second tubular body (13); and means for rotating the printing head (3), said means being coupled to the first tubular body (2) so as to rotate the second tubular body (13) around a cylindrical axis (R) thereof, the means comprising a motor (4). Also, both a printer and a method for printing with cementitious material.