In order to overcome the limitations and problems that earlier apparatus and methods have experienced, a 3D printing head (18) comprising a nozzle (20； 20A； 20B) is proposed, wherein the nozzle (20； 20A； 20B) comprises:- a material extrusion portion (22A； 22B), and- at least one protective gas injection portion (24A； 24B) co-acting with said material extrusion portion (22A； 22B).A related apparatus (10) for 3D printing an article (12), in particular a food article, is also proposed.A related method of 3D printing an article (12), in particular a food article, is also proposed.
