STL Export for AutoCAD is a Stereolithography (.stl) file export plug-in for AutoCAD®. This plug-in gives AutoCAD the ability to export geometric data from AutoCAD to ASCII and Binary STL files.
STL Export for AutoCAD extracts facet data from 3D Solids as well as 3D Face, Polygon Mesh and PolyFace Mesh objects in the active AutoCAD drawing and exports it to a STL file....
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Support for STL Export for AutoCAD is available from the
publisher/developer site 
This download is a demo of STL Export for AutoCAD. "Demoware (also known as trialware) is commercial software released for free (shareware) in a version which is limited in one or more ways." More info at
Wikipedia.
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