Michael Larkin imagined and printed a 6WD rover able to explore a backyard as well as a rough terrain. Firstly, he concentrates on the platform and then added a camera and a printed robot arm. With all these technologies, the robot is ready to use in the real world to spy, pick up and carry items from place to place.
Here is the project
http://www.intorobotics.com/moon-one-a-3d-printed-6wd-all-terrain-rover-with-camera-and-a-robot-arm/
http://www.intorobotics.com/moon-one-a-3d-printed-6wd-all-terrain-rover-with-camera-and-a-robot-arm