A multi-nozzle assembly may include a first nozzle configured to extrude material through a first outlet; a second nozzle configured to extrude material through a second outlet; and a third nozzle configured to extrude material through a third outlet, the third outlet being between the first and second...http://www.google.com/patents/US20040164436?utm_source=gb-gplus-sharePatent US20040164436 - Multi-nozzle assembly for extrusion of wall
