3D Printing, also called additive manufacturing, is the process of taking a digital model of an object of any geometric shape and creating a three-dimensional (3D) solid object replica. A 3D printer uses rapid prototyping, a pre-production process that allows manufacturers to scale a model using computer-aided design (CAD) data, or modeling software. A solid object is created using layers of various materials such as liquid, paper, powder, or metal that form a series of cross sections. The additive process automatically fuses the joined layers to create the object. Using a 3D printer filament, commonly supplied in various colors on spools, the 3D printer is able to create a smooth extrusion, creating a shape form as the material comes through the nozzle.