Rapid prototyping is the process used in engineering to design and build a representative model to use in testing engineering components and systems. This is a key step in the "develop and prototype solutions" part of the engineering design process. The rapid prototyping process using Computer Aided Design (CAD) and 3D printing technology allows us to more quickly model components at relatively quick rate and at reduced cost as compared to classical engineering drawing and machine shop fabrication of components. This allows the rapid refinement of engineering designs in order to obtain and optimum solution.