Subtractive manufacturing (computer numerical control, or CNC machining) has been one of the most preeminent manufacturing methods for the past several decades. Introduced in the 1940’s, subtractive manufacturing was used as a tool to machine highly complex parts that require optimal precision. Essentially, the process involves subtracting or cutting from a block of material to create an end product. Today, subtractive manufacturing comes in many different forms (milling, turning, laser cutting, wire EDM, and carving) and is used for a wide variety of prototyping, production and assembly line applications.