Yet another 3D printable model search engine has emerged on the scene. It's called Yobi3D and it is very easy to use and intuitive. The user interface is very simple, and thus far they have a decent amount of models within their database, taken from a variety of repositories across the internet like Grabcad, and Turbosquid. Yobi3D allows for users to get an entire view of any object within their interface, prior to clicking off to the actual file for download. More details on this search engine can be found here: http://3dprint.com/11466/yobi3d/

Below you will see what a typical search for 'toy car' turns up: