As defined by the ASTM F42 committee, there are seven major 3D Printing process families, of which five are currently capable of printing in metal. Each has a collection of strengths and relative weaknesses. Each is distinctly geared toward a different type of application. This presentation will provide a summary overview on each of the seven key processes, outlining pros, cons, and applications commonly served. Powder Bed Fusion, Directed Energy Deposition, Sheet Lamination, Binder Jetting, and Extrusion will all be addressed.