FBX (Filmbox) is a proprietary file format (. The FBX format is the gold standard in its support for the variety of data in its format. Free FBX 3D models for download, files in fbx with low poly, animated, rigged, game, and VR options. An FBX file is a 3D model saved in the Autodesk Filmbox format. Fbx 3D models ready to view, buy, and download for free.