フォーマットガイド
The universal 3D printing format — simple triangle meshes readable by every slicer, CNC system and mesh tool.
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| Extension | .stl |
|---|---|
| Full name | STereoLithography / Standard Triangle Language |
| Geometry type | Triangle mesh (facets) |
| Variants | ASCII, Binary |
| Open standard | Yes |
| Supports color | No (binary variant has unofficial color extensions) |
| Supports assemblies | No |
| Supports materials | No |
STL (STereoLithography) was developed by 3D Systems in 1987. It represents a 3D surface as triangular facets. STL comes in ASCII and binary variants. STL stores no color, material, texture, or assembly information — just raw geometry. Every slicer software accepts STL.
STL is the default export format for 3D printing. The mesh must be watertight for slicing to work correctly.
Many CAM systems accept STL as input for generating machining toolpaths from 3D geometry.
Engineers export design drafts as STL for quick desktop printing to check form and fit.
Every slicer (PrusaSlicer, Cura, Bambu Studio), all major CAD systems (SolidWorks, Fusion 360, FreeCAD) and all CAM packages.
Commonly converted from STEP or IGES (for 3D printing), to 3MF (for better metadata), or to OBJ (for rendering).