Abstract: A cooling device for an extruder of a three-dimensional (3D) printer includes a cooling fan, a supply duct, and a cooling duct. The cooling fan generates a fluid stream which is directed to the cooling duct through the supply duct. The cooling duct has an outlet portion that is ring shaped. The outlet portion has an inner wall and an outer wall, the inner wall having a plurality of outlet holes which evenly distribute the fluid stream in a 360-degree pattern around a print nozzle of the extruder to cool the print nozzle, deposited resin, and/or a print surface.