I agree regarding FBX, but OBJ is a relative printing format. For example, a lot of people who do 3d printing use Meshmixer to prepare models, and OBJ is one of the default model types it can accept. Also, many people use SLS printing and upload to services like Shapeways. Again, OBJ is acceptable there. I think OBJ, STL, PLY, VRML (for color prints), WRL, and AMF or 3MF are the most commonly accepted file types. Obviously, STL is the most common by far, but the only one that doesn't make sense for printing is really FBX.