NASA has opened a section of their site devoted to 3D resources. These are models of spaceships, asteroids and various topographic models available in STL format, one of the main formats used in the field of 3D printing. Other models are in various formats such as 3DS, which is used in 3D modeling byt the program Autodesk 3ds Max, or MB, used by Autodesk Maya. It’s a resource just opened and for that reason referred to as Beta, but the plan is to add new models over time.