3D printer uses lasers to create metallic objects in midair
 

This Harvard-made 3D printer can create complex metallic objects other printers can't. See, instead of spitting out one layer over another, the machine was designed to ooze out metal that immediately freezes solid. That allows it to print free-form p...

http://www.engadget.com/2016/05/17/h...-silver-laser/