In addition to additive production processes, one must also consider the possibilities of subtractive processes such as CNC machining and laser cutting. Subtractive processes, as the name implies, create objects by removing unwanted material from a large block or sheet in the form of chips. CNC machining of 3D CAD models (normally called CAD/CAM) is not actually considered a rapid prototyping process (although it can be as fast), but both additive and subtractive approaches are important aspects of today’s prototyping industry.