Think of life's most embarrassing moments. Now imagine that embarrassment multiplied thousands of times. At New York University, a technical foul-up meant that that hitting "reply all" to an email sent it to 40,000 people. It all started with one guy who just wanted to forward an email from the school to his mom. Some argue 3D printing is the next manufacturing revolution: Computer printers that go beyond flat images to squirt out three dimensional objects. But could it also start a revolution for a unique hobby? An engineering professor and pair of student brothers at the University of Virginia have built and flown a drone made out of parts from a 3D printer. Along with quick manufacturing capabilities, 3D printing drones could result in design improvements.