# FBX to STL Converter

> To convert FBX to STL, load the FBX scene, take its meshes in their rest pose and write the triangles to an STL file. Kenerate's free converter does it in your browser: drop the .fbx, fit the longest side in millimetres, keep Z-up on and download a binary STL. Textures, bones and animation are dropped. Nothing is uploaded.

URL: https://kenerateai.com/fbx-to-stl
Publisher: Kenerate AI (https://kenerateai.com)
Last updated: 2026-10-01

## Key facts
- Price: Free, no account
- Converts: FBX 7.x (binary or ASCII) → binary STL
- Pose: Rest / bind pose
- Scale: Keep units or fit longest side to 25–200 mm
- Dropped: Textures, materials, bones, animation
- Privacy: Converted locally — no upload
- Printable size: FBX units vary (centimetres in many tools). Fit the longest side — 50 mm, 75 mm — and stop guessing.
- Upright on the plate: Z-up turns the usual Y-up game orientation into what slicers expect.
- Check thickness: Clay view shows thin capes, hair cards and single-sided planes that won't print well.
- One merged mesh: All parts are written into one STL in their positions.
- Parse: The FBX scene is rebuilt with its meshes and transforms.
- Pose: Rigged meshes are taken in their rest pose.
- Scale and orient: Fit to your size in millimetres and turn Z-up.
- Write: Every triangle goes into one binary STL.
- FBX (Filmbox): Proprietary scene format; by Autodesk, 1996 (Kaydara). Holds: Meshes and materials, Skeletons, skinning and animation, Cameras and lights. Lacks: An open specification. Best for: Game engines and animation pipelines. Opens in: Unity, Unreal Engine, Maya, 3ds Max, Blender.
- STL (Stereolithography): Triangle mesh (binary or ASCII); by 3D Systems, 1987. Holds: Triangle surfaces, Facet normals. Lacks: Colour and textures, Units, Materials. Best for: 3D printing — every slicer opens it. Opens in: Cura, PrusaSlicer, Bambu Studio, OrcaSlicer, Blender.
- Made for — FBX vs STL: Games, film and animation | 3D printing
- Materials and textures — FBX vs STL: Yes | No
- Rigs and animation — FBX vs STL: Yes | No
- Units — FBX vs STL: Set per file | None (mm assumed)
- Slicer support — FBX vs STL: No | Universal

## Steps
1. Open the FBX — Drop your .fbx onto the box above, or try the sample chest.
2. Check printability — Use Clay view to look for thin or open parts.
3. Set size — Fit the longest side in millimetres; keep Z-up on.
4. Download — Click Download STL and open it in your slicer.

## In depth

### Screen models vs printable models
Real-time assets are built to look right, not to be solid: open edges, overlapping parts and zero-thickness planes are normal in games [3]. A printable STL needs closed, thick-enough shells [1]. Expect to repair game assets in your slicer or Blender.

### Units and scale
FBX files store a unit scale, often centimetres. STL stores none [1], so fit the model to a known size before printing.

References:
[1] Wikipedia — STL (file format): https://en.wikipedia.org/wiki/STL_(file_format)
[2] Wikipedia — Wavefront .obj file: https://en.wikipedia.org/wiki/Wavefront_.obj_file
[3] Wikipedia — FBX: https://en.wikipedia.org/wiki/FBX
[4] Khronos Group — glTF: https://www.khronos.org/gltf/
[5] 3MF Consortium — 3MF specification: https://3mf.io/specification/
[6] Wikipedia — Universal Scene Description (USD / USDZ): https://en.wikipedia.org/wiki/Universal_Scene_Description
[7] Wikipedia — PLY (file format): https://en.wikipedia.org/wiki/PLY_(file_format)
[8] Khronos Group — glTF 2.0 specification: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html
[9] Apple — AR Quick Look: https://developer.apple.com/augmented-reality/quick-look/
[10] three.js — documentation: https://threejs.org/docs/
[11] Prusa Knowledge Base — Modeling with 3D printing in mind: https://help.prusa3d.com/article/modeling-with-3d-printing-in-mind_164135
[12] Prusa Blog — lithophanes and filament transparency: https://blog.prusa3d.com/lets-play-with-filament-transparency-how-to-make-amazing-lifelike-color-photos-with-just-a-simple-color-change_104338/
[13] Polymers (2024) 16(20):2862 — FFF parameters and translucency of PLA: https://doi.org/10.3390/polym16202862
[14] Wikipedia — Lithophane: https://en.wikipedia.org/wiki/Lithophane
[15] W3C — CSS Values and Units Level 3 (absolute lengths): https://www.w3.org/TR/css-values-3/
[16] Adobe Substance 3D — OpenGL vs DirectX normal maps: https://experienceleague.adobe.com/en/docs/substance-3d/bakers/common-questions/what-is-the-difference-between-the-opengl-and-directx-normal-format
[17] Blender Manual — Normal Map node: https://docs.blender.org/manual/en/latest/render/shader_nodes/displacement/normal_map.html
[18] Wikipedia — Normal mapping: https://en.wikipedia.org/wiki/Normal_mapping
[19] SIL Open Font License: https://openfontlicense.org/

## FAQ
Q: Is FBX to STL conversion free?
A: Yes — free and private, with no account.

Q: Will my character print in its animated pose?
A: No, it's exported in its rest pose. Pose it in Blender first if you want a different stance.

Q: Why are parts missing or paper-thin?
A: Game models often use single-sided planes for hair, cloth and leaves. They have no thickness and won't print; thicken them in Blender with a Solidify modifier.

Q: Will colours be kept?
A: No — STL has no colour. Use 3MF or paint in your slicer.

Q: Is my file uploaded?
A: No. It's converted on your device.

Q: Can I convert STL to FBX?
A: Not here — the tools export open formats only, and FBX is Autodesk's closed format. Convert the STL to GLB or OBJ instead; Unity, Unreal and Blender import both, and Blender can then export FBX if a pipeline insists on it.

Q: Can I use any game model?
A: Only models you have the rights to use. Check the asset's licence before printing or selling prints.

## Related pages
- AI 3D Model Generator: https://kenerateai.com/ai-3d-model-generator
- Image to 3D: https://kenerateai.com/image-to-3d-converter
- AI STL Generator: https://kenerateai.com/ai-3d-printing-model-generator
- Text to 3D: https://kenerateai.com/text-to-3d-generator

## Sources
- Wikipedia — STL (file format): https://en.wikipedia.org/wiki/STL_(file_format)
- Wikipedia — Wavefront .obj file: https://en.wikipedia.org/wiki/Wavefront_.obj_file
- Wikipedia — FBX: https://en.wikipedia.org/wiki/FBX
- Khronos Group — glTF: https://www.khronos.org/gltf/
- 3MF Consortium — 3MF specification: https://3mf.io/specification/
- Wikipedia — Universal Scene Description (USD / USDZ): https://en.wikipedia.org/wiki/Universal_Scene_Description
- Wikipedia — PLY (file format): https://en.wikipedia.org/wiki/PLY_(file_format)
- Khronos Group — glTF 2.0 specification: https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html
- Apple — AR Quick Look: https://developer.apple.com/augmented-reality/quick-look/
- three.js — documentation: https://threejs.org/docs/
- Prusa Knowledge Base — Modeling with 3D printing in mind: https://help.prusa3d.com/article/modeling-with-3d-printing-in-mind_164135
- Prusa Blog — lithophanes and filament transparency: https://blog.prusa3d.com/lets-play-with-filament-transparency-how-to-make-amazing-lifelike-color-photos-with-just-a-simple-color-change_104338/
- Polymers (2024) 16(20):2862 — FFF parameters and translucency of PLA: https://doi.org/10.3390/polym16202862
- Wikipedia — Lithophane: https://en.wikipedia.org/wiki/Lithophane
- W3C — CSS Values and Units Level 3 (absolute lengths): https://www.w3.org/TR/css-values-3/
- Adobe Substance 3D — OpenGL vs DirectX normal maps: https://experienceleague.adobe.com/en/docs/substance-3d/bakers/common-questions/what-is-the-difference-between-the-opengl-and-directx-normal-format
- Blender Manual — Normal Map node: https://docs.blender.org/manual/en/latest/render/shader_nodes/displacement/normal_map.html
- Wikipedia — Normal mapping: https://en.wikipedia.org/wiki/Normal_mapping
- SIL Open Font License: https://openfontlicense.org/