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| Name | Rhino OpenNURBS | STereoLithography |
| File extension | .3dm | .stl |
| Original software | Rhinoceros 3D | |
| Binary | ■ | ■ |
| ASCII | ■ | |
| Polygonal | ■ | ■ |
| NURBS | ■ | |
| Solids | ■ | |
| Smoothing groups | ■ | |
| Textures, materials | ■ | |
| Developer/Owner | Robert McNeel & Associates | |
| Description | ||
| Specification | OpenNURBS | The StL Format |
| Format features | The format of the first NURBS-Modeling software for Windows. Is currently open, so there are converters from/to lots of formats | One of the most ubiquitous exchange formats polygonal geometry between CAD-systems. Can have both binary and ASCII-structure, which is why the same file can vary in size tenfold. See also PLY |
| Viewing software | Deep View (free) | GLC_Player (free), MeshLab (free) |