Patent ID: 7261541

Claim:
A cooling system in an apparatus for forming three-dimensional objects, the cooling system removing heat from layers of a three-dimensional object formed in a layerwise manner from a build material selectively deposited from at least one orifice in a build chamber, the system being within and in fluid flow communication with the build chamber and comprising: at least one fan for generating a flow of air through the build chamber; at least one air duct having an inlet end and an exit end opening into the build chamber, the air duct being in communication with the fan for receiving the flow of air at the inlet end, the air duct shaping the flow of air into a uniform sheet of air flow and delivering the uniform sheet of air flow from the exit end across the layers of the three-dimensional object in the build chamber, said air duct has a protrusion on the exit end, the protrusion diverting the uniform sheet of air flow away from the air duct and towards the layers of the three-dimensional object.