Here's a robot video that I found interesting:
AFRL Discvoery Lab's DMAV Aircraft
Flight Testing - 6 August 2013
Learn More: http://wbi-icc.com/dmav_project
First Day Testing: http://youtu.be/xeeBiBHI8_s
The first fixed wing aircraft to have a fully 3D printed airframe using FDM technology. The airframe has no internal reinforcements such as carbon rods or otherwise, making this aircraft unique compared to other FDM aircraft which depend on reinforcements for structural integrity. It is additionally believed to be the first low-wing style plane to be 3D printed.
By Nathan Kidder