---
title: "3MF to STL"
description: "Convert 3MF files to standard STL online for Cura and PrusaSlicer. Split multi-part models into ZIP and adjust print orientation locally in browser."
toolId: "3mf-to-stl"
category: "conversion"
subgroup: "model-conversion"
subgroupName: "3D Model Format Conversion"
url: "https://any3d.cc/en-US/tools/3mf-to-stl"
markdown: "https://any3d.cc/llm/tools/3mf-to-stl.md"
---

# 3MF to STL

Convert 3MF project files to universal STL models: extract clean geometry, split multi-part meshes into a ZIP archive, and adjust print bed orientation for Cura and any 3D printer.

**Category:** 3D Format Conversion Tools (`conversion`)
**Subgroup:** 3D Model Format Conversion (`model-conversion`)

**HTML:** https://any3d.cc/en-US/tools/3mf-to-stl

> Runs entirely in the browser. Files are not uploaded to Any3D servers.

## Overview

Convert 3MF project files from MakerWorld, Bambu Studio, or CAD software into standard STL format. Strip proprietary slicer profiles and printer presets to obtain a clean, watertight triangular mesh. Split multi-part assemblies into individual STL files inside a ZIP archive in one click, and fine-tune print orientation using interactive 3D rotation controls. All calculations run entirely in your local browser without uploading files.

## About Configuration Options

### General Settings

- **Up axis** (Default: Z-up): Determines the 'up' axis of the exported model. Different 3D software uses different conventions. Selecting the wrong system may cause the model to lie on its side.
  - `y-up` — Y-up: Convention used by OpenGL, Three.js, and most Web 3D engines. Choose this for models from web or game engines.
  - `z-up` — Z-up (Recommended): Convention used by Blender (default), 3ds Max, and some CAD software. Try this if the model appears sideways.
- **Rotation X** (Default: 0°; Range: -180° – 180°): Rotate the model around the X axis (degrees). Useful for correcting axis misalignment or print orientation.
- **Rotation Y** (Default: 0°; Range: -180° – 180°): Rotate the model around the Y axis (degrees). Useful for correcting axis misalignment or print orientation.
- **Rotation Z** (Default: 0°; Range: -180° – 180°): Rotate the model around the Z axis (degrees). Useful for correcting axis misalignment or print orientation.
- **Rotation Application** (Default: Root node transform): Choose how rotation is written to the exported model. Baking into vertices rewrites all vertex coordinates so every export format (including geometry-only formats such as STL and STEP) applies it consistently; root node transform keeps the original vertex coordinates, which is friendlier to animated or skinned models, but formats that ignore node transforms (such as STEP) won't apply the rotation.
  - `bake` — Bake into vertices: Rotation is written into all vertex coordinates and applies consistently to every export format; geometry data is rewritten.
  - `node` — Root node transform (Recommended): Rotation is written as a root node transform while vertex coordinates stay unchanged; better for skinned or animated models, but formats that ignore node transforms (such as STEP) won't apply it.

### STL Output Settings

- **Binary Format** (Default: Binary STL): Choose the STL storage format. Both formats produce identical print results.
  - `true` — Binary STL (Recommended): Smaller file, faster to load. Supported by Cura, PrusaSlicer, Chitubox and all major slicers. Recommended for 3D printing.
  - `false` — ASCII STL: Plain text format, readable in any text editor for debugging. File size is ~4-6x larger than binary.
- **Split Multiple Parts** (Default: off): Export independent meshes as separate STL files packaged in a ZIP archive.

## Format Information

### Input format

- **Extension:** 3mf
- **Full Name:** 3D Manufacturing Format
- **Type:** 3D Model
- **Format:** 3MF
- **Tools:** [Bambu Studio](https://bambulab.com/en/download/studio), [PrusaSlicer](https://www.prusa3d.com/p/prusaslicer/), [OrcaSlicer](https://github.com/OrcaSlicer/OrcaSlicer), [Cura](https://ultimaker.com/software/ultimaker-cura/)
- **Open With:** Windows 3D Viewer, [3MF Viewer Online](https://any3d.cc/en-US/tools/3mf-viewer), [Blender](https://www.blender.org), [3D Model Viewer](https://any3d.cc/en-US/tools/3dmodel-viewer)
- **Description:** 3MF is a modern 3D printing format from the 3MF Consortium, based on XML and packaged as a ZIP container. It preserves mesh data and supports per-part color, material, texture, and print properties. It is recommended for multi-color and multi-material printing. Major slicers (Bambu Studio, PrusaSlicer, OrcaSlicer) have native support.

Compared to STL, 3MF carries richer information but is more complex. Some older slicers and printers may not recognize it. When converting from other formats, color and material mapping depend on source data. For simple single-color printing, STL remains sufficient. For multi-color, multi-material, or print parameter transfer, choose 3MF.
- **Supported Features:**
  - Per-part and per-vertex color support
  - Material and texture preservation
  - XML-based with ZIP compression
  - Native support in Bambu Studio, PrusaSlicer, OrcaSlicer
- **Notes:**
  - Some older slicers and printers may not support 3MF
  - More complex than STL but carries richer information

### Output format

- **Extension:** stl
- **Full Name:** Stereolithography
- **Type:** 3D Mesh
- **Format:** STL (Binary / ASCII)
- **Tools:** [Cura](https://ultimaker.com/software/ultimaker-cura/), [PrusaSlicer](https://www.prusa3d.com/p/prusaslicer/), [Chitubox](https://www.chitubox.com), [Simplify3D](https://www.simplify3d.com)
- **Open With:** Slicer Software, [MeshLab](https://www.meshlab.net), Windows 3D Viewer, [STL Viewer Online](https://any3d.cc/en-US/tools/stl-viewer)
- **Description:** STL is the de facto standard mesh format in 3D printing, storing only triangular surface data since 1987, without color, texture, or material. Almost all slicers (Cura, PrusaSlicer, Bambu Studio, ChiTuBox) and printers directly support STL, ensuring its enduring popularity.

Two classic pitfalls: STL lacks unit definitions, making millimeters and inches indistinguishable on disk; always verify scale in your slicer. It also has ASCII (readable but 4-6x larger) and binary (compact, default) encodings. For multi-color printing, materials, or parameters, switch to 3MF, which carries richer print information while maintaining slicer compatibility.
- **Supported Features:**
  - Triangle mesh only, simple and universally compatible
  - Binary and ASCII encoding options
  - Directly importable into Cura, PrusaSlicer, Chitubox, etc.
- **Notes:**
  - Does not support colors, textures or materials
  - No unit definition; verify scale in your slicer
  - ASCII format is 4-6× larger than binary

## How to use

### 1. Import 3MF file

Drag and drop your 3MF project file into the browser for immediate local geometry parsing and 3D preview.

### 2. Configure STL settings

Select Binary STL and enable Split Multi-Part Mesh if you want separate components packaged into a ZIP archive.

### 3. Check dimensions and orientation

Verify the physical millimeter dimensions and adjust rotation on the build plate if required.

### 4. Download STL output

Click Download to instantly save your slice-ready STL file or multi-part ZIP archive to your computer.

## FAQ

### Why do MakerWorld or Bambu Lab 3MF files fail to open or show errors in Ultimaker Cura?

MakerWorld and Bambu Studio 3MF files are project packages bundled with machine-specific slicer profiles, multi-plate setups, and custom XML tags. Slicers like Ultimaker Cura or older PrusaSlicer versions cannot parse these vendor-specific tags. Converting to STL extracts the pure 3D surface mesh and removes incompatible slicer configurations so you can slice and print on any machine.

### Can I split a multi-part 3MF project into individual STL files?

Yes. Turn on the Split Multi-Part Mesh option in the STL settings. If your 3MF model contains multiple distinct geometries, each part will be generated as an independent STL file packaged inside a downloadable ZIP archive. If this option is turned off, all components are combined into a single unified STL file.

### Should I choose Binary STL or ASCII STL?

Binary STL is strongly recommended for 3D printing. Binary files are 4 to 6 times smaller, load much faster in Cura, PrusaSlicer, OrcaSlicer, Chitubox, and Lychee, and are universally supported. ASCII STL is only useful when you need to inspect raw vertex coordinates with a text editor.

### Are the exported STL files watertight and ready for FDM or resin printing?

Yes. As long as the source 3MF geometry is a solid body, the resulting STL maintains manifold topology. You can inspect overall bounding box dimensions, triangle counts, and vertex density in the info panel before importing the file into your slicing software.

### Can I turn the STL back into 3MF?

Yes, with the STL to 3MF converter. Colors and slicer settings that were dropped during this conversion will not come back.

### Do 3MF files from PrusaSlicer or Cura work too?

Yes. 3MF is an open standard, so the shapes from these slicers open as well; their print settings are left out, just like with Bambu Studio files. You can convert them here without downloading another slicer.