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STL is a document format developed to store CAD stereolithography, a 3D technique created for easily converting image files to solid virtual objects.
One uses the STL format during the stereolithography to permit the generated CAD models to be viewed using a larger array of 3rd party CAD apps.
STL files describe raw unstructured triangulated surfaces with the help of a 3D Cartesian coordinate system.
When having to create a DWG file, users will be able to preview the source file, to modify it, export it to the STL format, then preview it again to make sure that the output suits his / her needs.