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The Winter 2012 edition of Additive Manufacturing features an article on 3D printing of functional parts as a complement to injection molding, as well as an article on using additive manufacturing to engineer conformal cooling channels into molds. An editorial commentary introduces Additive Manufacturing and explains why we launched this supplement. To receive Additive Manufacturing as part of your subscription to Modern Machine Shop or MoldMaking Technology, go to mmsonline.com/subscribe or moldmakingtechnology.com/subscribe.