--- title: "GLB to STL" description: "Convert GLB to STL for 3D printing. Geometry is preserved while colors, textures, and animations are removed. All processing happens locally in your browser; no uploads." toolId: "glb-to-stl" category: "conversion" subgroup: "model-conversion" subgroupName: "3D Model Format Conversion" url: "https://any3d.cc/en-US/tools/glb-to-stl" markdown: "https://any3d.cc/llm/tools/glb-to-stl.md" --- # GLB to STL GLB to STL Converter for 3D Printing **Category:** 3D Format Conversion Tools (`conversion`) **Subgroup:** 3D Model Format Conversion (`model-conversion`) **HTML:** https://any3d.cc/en-US/tools/glb-to-stl > Runs entirely in the browser. Files are not uploaded to Any3D servers. ## Overview This tool extracts the static mesh from a GLB and exports STL for slicing. Animations and skeletons are not kept. Before printing, check that the model is a closed watertight solid and that the units are correct. Triangulation and export happen locally in your browser, so your file never leaves your device. The result is a watertight STL ready for printing. ## 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:** glb - **Full Name:** GL Transmission Format Binary (glTF 2.0) - **Type:** 3D Model - **Format:** GLB - **Tools:** [Three.js](https://threejs.org), [Babylon.js](https://www.babylonjs.com), [Blender](https://www.blender.org) - **Open With:** [3D Model Viewer](https://any3d.cc/en-US/tools/3dmodel-viewer), [GLB Viewer](https://any3d.cc/en-US/tools/glb-viewer) - **Description:** GLB is the binary glTF 2.0 format from Khronos Group, packing meshes, materials, textures, and animations into one file. It is the standard for Web 3D and AR/VR, used by Three.js, Babylon.js, model-viewer, and e-commerce previews for self-contained, reliable distribution. GLB supports PBR materials, skeletal animations, Draco and Meshopt compression, suitable for web, AR, and cross-software use. However, it loses CAD parametric history when tessellated from STEP or native CAD. For 3D printing, use STL or 3MF as slicers cannot import GLB. - **Supported Features:** - Single self-contained binary file - PBR material support (base color, metallic, roughness, normal maps) - Skeletal animation, skinning, and morph targets - Draco mesh compression and KTX2 texture compression - Multi-mesh nodes and scene hierarchy - **Notes:** - Some 3D printing slicers cannot directly import GLB files - Not suitable for CAD parametric editing ### 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 GLB Scene Load your web 3D model containing single or multi-part geometries. ### 2. Choose Binary Format Select Binary STL for optimal slicer compatibility and smaller export size. ### 3. Check Coordinate Alignment Match the coordinate system (Y-Up or Z-Up) with your 3D printer bed convention. ### 4. Export Watertight STL Download merged single STL geometry ready for 3D slicing software. ## FAQ ### Can the converted STL be used for CNC machining? Yes. STL is a common input format for CNC and CAM workflows. Since the tool exports pure geometry, you can load the STL into CAM software and generate toolpaths just like any other STL. ### The converted model looks faceted. Is that normal? Yes. STL represents surfaces with flat triangles, so curved areas can look faceted up close. Smoothness depends on the mesh density of the source GLB; a denser mesh produces a smoother result. ### Can I convert a 3D scan from a phone app? Yes, if the app exports GLB. Scans often have holes or a rough base, so let your slicer repair the mesh or flatten the bottom before printing. ### Should I print from STL or 3MF? STL is the most widely accepted. 3MF also keeps units and colors, so if your slicer supports it, GLB to 3MF is worth a try. ### Will the STL be larger than the GLB? Often yes. In a typical GLB STL conversion the file grows, because STL repeats the corner points of every triangle and has no compression, while GLB stores them compactly. ### Can I print a character from a game or Sketchfab? Only if the license allows it. Game models often have paper-thin parts such as hair or clothing; give those parts thickness in a modeling app before printing.