Convert SH3D to 3MF (Free)
Also converts STL, OBJ, GLB, PLY, USDZ, WRL from the same file.
Runs in your browser. No upload, no signup, nothing to install.
Also from Innerscene: Circadian Lab, a free lighting calculator for room illuminance, melanopic EML, and glare.
How to convert SH3D to 3MF
- 1
Open your .sh3d file
Drag it onto the viewer above, or click "Open an SH3D File". Files up to 200 MB open directly; the parse runs in a worker so the page stays responsive.
- 2
Pick 3D Manufacturing Format in the Export menu
Click Export in the toolbar, then 3MF (.3mf).
- 3
Download
The .3mf is written in the browser and saved straight to your downloads folder. No queue, no email, no watermark.
What survives the conversion
A file conversion is a translation, and formats do not carry the same things. Here is exactly what moves from SH3D into 3MF, and what does not.
| Geometry | Kept | Both formats store triangle meshes, so the shape transfers directly. |
|---|---|---|
| Colors and materials | Reduced | SH3D can hold material colors and 3MF holds one color per object, so materials are flattened to that. |
| Textures | Dropped | 3MF does not carry texture images, so a textured model arrives in flat material colors. |
| Layers and structure | Reduced | 3MF has named objects but no layers, so each layer becomes a named part instead. |
| Units and scale | Kept | 3MF stores an explicit unit, so the model opens at true size without rescaling. |
| Lines and points | Dropped | 3MF geometry is manifold mesh only, so line work and point clouds are skipped. |
What the 3MF writer emits: An OPC package in millimeters, Z-up, with each mesh as its own named object carrying a basematerials color, placed by a build item.
The source: Sweet Home 3D home (.sh3d)
The whole home: walls with the openings their doors and windows cut, room floors and ceilings, and every placed piece of furniture with its own model, colours and textures, level by level, in centimetres.
The target: 3D Manufacturing Format (.3mf)
The modern replacement for STL: named parts, per-object color, and units that are actually in the file.
Opens in: PrusaSlicer, Bambu Studio, Cura, Windows 3D Builder, Fusion 360.
Your file never leaves your computer
Both the SH3D parser and the 3MF writer are JavaScript and WebAssembly running in your own browser tab. There is no upload step, no server-side conversion queue, and no copy of your file anywhere but your machine. That matters for drawings under NDA, for client work, and for anything you would not email to a stranger.
Free to Use, No Signup
There are no accounts and no watermarks on this converter. If it saved you time, the one thing we ask is a mention: a post, a link from your blog or course page, or a reply to someone asking how to open a file.
Share it
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Hear about new formats
Occasional emails when the viewer learns a new format or gets a new tool.
Frequently asked questions
▶Is this SH3D to 3MF converter free?
Yes. No signup, no watermark, no per-file limit and no paid tier. Innerscene.
▶Is my SH3D file uploaded anywhere?
No. The file is read with the browser file API and converted in the same tab. Nothing is sent to a server unless you explicitly click Share, which is a separate, opt-in feature.
▶Will my colors and materials survive the 3MF export?
SH3D can hold material colors and 3MF holds one color per object, so materials are flattened to that.
▶Do layers and named parts carry into the 3MF file?
3MF has named objects but no layers, so each layer becomes a named part instead.
▶Will the 3MF open at the right size?
3MF stores an explicit unit, so the model opens at true size without rescaling.
▶How large an SH3D file can I convert?
Up to 200 MB, and the ceiling adapts to how much memory your device reports. The conversion runs on your own hardware, so a desktop with plenty of RAM will handle more than a phone.
▶Can I convert 3MF back to SH3D?
Not here. We read SH3D and write 3MF, but not the reverse. the universal 3D viewer
▶Which browsers does it work in?
Chrome, Edge, Firefox and Safari, on Windows, macOS, Linux, iOS and Android. No plugin and no extension.
Convert SH3D to something else
Convert something else to 3MF
Or start from the universal 3D viewer.