3D printing is ideal for rapid prototyping because it can take a CAD-file and create a 3D printed model in a few hours.
3D printers are available in a wide range of different models which mainly differ in the types sof material they can use. At KGM 3D Technology we almost exclusively use plastic types such as PLA and ABS. Metal parts are printed externally when needed.
For all materials other than PLA, ABS and metal, we prefer to cast them rather than 3D printing as 3D printed parts has a number of shortcomings due to the layer structure.