GLOSSARY
FBX File
FBX is a proprietary 3D scene format owned by Autodesk. It carries meshes, materials, skeletons, animation, lights, and cameras — the format of choice for game and film pipelines.
Definition
FBX began at Kaydara in 1996 as the file format for the Filmbox motion-capture software, was acquired by Autodesk in 2006, and is now the dominant interchange format between Maya, 3ds Max, Blender, Unity, Unreal, and motion-capture tools. It exists in both binary and ASCII forms; binary is what people actually ship.
FBX's differentiator is that it can carry a full animated scene: skeletal rigs, blend shapes, baked animations, multiple materials, cameras, and lights. STL or OBJ describe a static shape; FBX describes a moving character.
Why it matters
If you see FBX in a 3D pipeline, you are almost certainly looking at a game or VFX workflow. AI 3D tools sometimes export FBX for customers in those industries; for printing it is unhelpful.
The format is closed-source and Autodesk-controlled. Blender and others reverse-engineered the binary spec, which means FBX import/export is famously inconsistent — bones may flip, scales may change, materials may not survive a round-trip.
Common confusion
For new projects, glTF/GLB is the open standard that is replacing FBX wherever possible. FBX persists because Autodesk tools and legacy game engines still default to it.
You cannot print an FBX directly. Convert to STL via Blender or any mesh tool, and verify the result is manifold before slicing.