STL Export for SketchUp is a Stereolithography STL file export plug-in for Google SketchUp®. This plug-in gives SketchUp the ability to export objects in SketchUp to ASCII and Binary STL files.
STL Export for SketchUp tessellates objects in a SketchUp document into a set of triangular meshes. These meshes are then exported to a STL file as mesh objects. The STL file can then be imported into a variety of CAD applications....
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Support for STL Export for SketchUp is available from the
publisher/developer site 
This download is a demo of STL Export for SketchUp. "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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