STL files contain no scale information, and the units are arbitrary. In the original specification, all STL coordinates were required to be positive numbers, but this restriction is no longer enforced and negative coordinates are commonly encountered in STL files today. As the format is now used for multiple manufacturing processes STL has been associated with the backronym 'Simple Triangle Language'.Īn STL file describes a raw, unstructured triangulated surface by the unit normal and vertices (ordered by the right-hand rule ) of the triangles using a three-dimensional Cartesian coordinate system. Chuck Hull, the inventor of stereolithography and 3D Systems’ founder, reports that the file extension is an abbreviation for stereolithography. STL is a file format native to the stereolithography CAD software created by 3D Systems.
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