Russian hardware and software developer Sergey Grishchenko designed and built his own, mini version of the Mars Curiosity Rover. It is fully articulated, includes a grabbing claw, on-board cameras, and two spotlights. The rover connects to a computer via Bluetooth and is controlled using a remote that connects to a computer. Grishchenko has made the files available on Thingiverse. You can find out more about Curiosity over on 3DPrint.com: http://3dprint.com/67428/3d-printed-curiosity-model/
Below is a photo of the 3D printed Mars Rover: