In the late twentieth century, a trend emerged in industrial design that is now evolving into a major manufacturing revolution. Additive manufacturing, better known as 3D printing, is the process of creating physical three-dimensional objects by layer-by-layer deposition (adding) of material based on a digital 3D model. This fundamentally distinguishes it from traditional subtractive manufacturing methods—such as milling, turning, or stamping—where a part is created by cutting away “excess” material from a solid workpiece, inevitably generating a huge amount of waste.