A method of forming a tapered bore an orifice layer of a photo-resist comprises forming a lens in a surface of a first unexposed portion of the layer and exposing the first unexposed portion through a bore-hole mask to define an exposed portion and a second unexposed portion, wherein the second unexposed portion has a tapered shape. The layer is baked to cross-link the exposed portion and developed to remove the second unexposed portion to form a tapered bore hole. The tapered bore hole has a shape corresponding to the tapered shape.