One way to create 3D object is to scan a real object with a 3D scanner. The software associated with the scanner will export a .STL file which can be printed by the 3D printer.
iSense hand held scanner is a portable scanner. You can check out the scanner with your ID card and an iPad.
Instruction on how to use the scanner and tablet will be provided at check out.
To scan an object with the Sense handheld scanner: