A few years ago NASA assembled a huge repository of their 3D data and released it to the public, and initially that included about 20 3D printable models. As their current collection of 3D Printable Models has grown to over 80, many of them have actually been optimized to be easily 3D printable. And a few of the more complicated 3D printable models actually have downloadable PDF printing and assembly instructions. The Curiosity Rover is even available as two different 3D printable model kits, a larger, more detailed version of Curiosity as well as a smaller more simplified version that is easier to 3D print and assemble. You can read more over on 3DPrint.com: https://3dprint.com/141333/nasa-3d-p...e-models-kits/