In the movie “Chinese Zodiac12” starred by Jackie Chan,  there is a plot, after the stolen national treasure Twelve Zodiac head data scanned by the computer, exactly the same animal head was duplicated by a magic machine. This plot gives a brief idea of 3D printing process. It seems simple and nothing special.3D printing is to print out the parts according to 3D drawings by 3d printer machine.It is currently another popular machining method in prototype industry.