By Lindsey Kratochwill for Popular Science:  Watching a 3D printer work can sometimes seem like magic--thin filaments slowly build up on top of a platform, turning into parts and figurines. Now, apatent published by aerospace company Boeing introduces an even more futuristic element: levitation.

With this method, the object prints while floating in midair thanks to magnets or acoustic waves. A "nugget" or base gets printed first out into space, and then a cadre of 3D printers add more and more of the printing material.

But why? Levitation is cool, yes, but it turns out there is also a practical purpose for a floating 3D printed object, at least according to Boeing's patent. The levitating object can be manipulated and turned more so than an object stuck to a platform can be, and using many printheads at the same time would ostensibly speed up the process.  Cont'd...