How can I use the 3D printers?

Hi Rana, First you need a3D printer for3D printing.3D printing is creating a real time prototype of a object in3 dimensional layers.
You can use3d designing Softwares like AUTOCAD, MAYA etc to to create3d models.
Check this link below for more details.
http://www.3ders.org/3d-printing-basics.html