In many cases 3D printing is replacing injection molding as a means of prototyping and even production. A UK company, Whale, who makes electronic pumping systems has been using 3D printing to create the actual injection molds they use for production. Whale has stated that since they have begun using 3D printing, they have saved 97% of the lead time it usually takes (4-5 weeks in general) with traditional manufacturing techniques. The full story can be found here: http://3dprint.com/4962/whale-3d-printerslead-times/