Principles of 3D printing: Ordinary printers used in daily life can print flat objects designed by computers, while the so-called 3D printers work basically the same principle as ordinary printers, except for some different printing materials. The printing materials of ordinary printers are ink and paper, while the 3D printers are equipped with metal, ceramic, plastic, sand and other "printing materials", which are real raw materials. When connected to a computer, the printer can be controlled by the computer to add layer upon layer of "print material", eventually turning the blueprints on the computer into real objects. In layman's terms, a 3D printer is a device that can "print" real 3D objects, such as a robot, a toy car, models and even food. They are colloquially called "printers" in reference to the technical principles of ordinary printers, because the process of layering is very similar to that of inkjet printing. The printing technology is called 3D stereoscopic printing. 

There are many different techniques for 3D printing. They differ in creating parts in the manner of available materials and in different layers of construction. Commonly used materials for 3D printing are nylon glass fiber, polylactic acid, ABS resin, durable nylon material, gypsum material, aluminum material, titanium alloy, stainless steel, silver plated, gold plated, rubber materials.