What is MIME type "model/3mf"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

model/3mf is the MIME type used for files in the 3D Manufacturing Format. This file format packages complex 3D data for additive manufacturing processes.

It bundles geometry, textures, and metadata in a single file. Files with the 3MF extension can include detailed print instructions and material information.

Supports rapid and accurate transfer of 3D models between design software and 3D printers.
Enables integration of multi-material and multi-color data in printing tasks.
Improves reliability and interoperability in modern manufacturing workflows.

This MIME type simplifies the exchange of comprehensive 3D assets and is backed by industry standards. For more details, visit the official 3MF website.

Associated file extensions

.3mf

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: model/3mf

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="model/3mf">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'model/3mf');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.3mf

FAQs

How do I configure my web server to serve .3mf files correctly?

You must explicitly register the MIME type model/3mf to ensure browsers handle the file as a 3D model rather than a generic archive. For Apache, add AddType model/3mf .3mf to your config or .htaccess. For Nginx, add model/3mf 3mf; inside the types block.

Why does my browser download .3mf files as ZIP archives?

This occurs because the 3MF format is technically a zipped container based on Open Packaging Conventions. If the server does not send the correct model/3mf header, the browser detects the file signature (magic number) as a ZIP file and defaults to application/zip.

Can web browsers render model/3mf files natively?

No, standard web browsers (Chrome, Firefox, Safari) do not currently render 3MF content natively without assistance. To display these files on a webpage, you must use JavaScript libraries such as Three.js or Babylon.js that support parsing the 3MF structure.

What is the advantage of using model/3mf over model/stl?

Unlike the older STL format which only stores geometry, model/3mf can contain information about materials, colors, textures, and scale in a single package. This makes it significantly more useful for modern additive manufacturing workflows found on mime-type.com and reduces print errors.

How do I add 3MF support to Microsoft IIS?

In the IIS Manager, navigate to your site, select MIME Types, and click "Add" in the Actions pane. Set the file name extension to .3mf and the MIME type to model/3mf. This ensures Windows servers deliver the correct content type header.

Is the model/3mf MIME type text-based or binary?

The model/3mf file itself is a binary ZIP archive, but the data inside consists primarily of human-readable XML files describing the 3D model. Because it is compressed, you cannot view the source directly in a text editor without unzipping it first.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.