This is one of the models from NASA's 3D Resources located at http://www.nasa.gov/multimedia/3d_resources/models.html
This particular model is found at http://www.nasa.gov/multimedia/3d_resources/assets/friendship_c2.html
Print one top and one bottom. Glue together.
Category: VehiclesThe author marked this model as their own original creation. Imported from Thingiverse.