A 3D printer is a type of printer that produces 3D solid objects from a digital file. It works by adding material in successive layers to create an object that has three-dimensional depth. 3D printing is used to create parts, tools, prototypes, and even art. 3D printers use a variety of materials, including plastic, metal, ceramic, and composite materials. Depending on the type of printer, the material is either added layer by layer or sprayed onto the object in layers. Recent advances in 3D printing technology have made it possible to print using a variety of materials and on a variety of scales. 3D printing can be used to create intricate, detailed parts and products in a fraction of the time and at a fraction of the cost of traditional manufacturing methods.