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I'm a saxophone mouthpiece craftsman and I want to learn CAD. I am signed up for a 14 day trial and I have an .stl file of a sax mouthpiece that appears when I load it, and I want to discover how to use the software.
It seems that nothing I do to make a change to this file works. I change dimentions and click the green check mark. Nothing. Is the .stl file not editable? Is my trial not allowing me to make changes? I see no way to export the file to other formats. All I want to do is change the shape and export as a .dwg file or some other generally acceptable CAD format. Can some one offer me some advise?