3D printing Filament is used in many countries, in fact many countries are launching 3D printing investment plans. India is already using the 3D printers for its CAD/CAE industries. 3D structures in the medical industry are helping to provide a better visualization of artificial human body parts. Medical 3D printers are used for this and are able to generate multiple identical copies of each item. The working of 3D printers is a bit easier, it starts with designing a 3D object on the computer then it is connected to the 3D printer.