Stl extension for 2022 pro?

Just bought 2022 pro, cannot find a STL extension other then SimLab which is not recommended for 2022 pro and generates a file warning. I want to save my work as a STL file for my Saturn printer. What / Where am I missing this needed extension?

Why do you want an extension to export STL files? SketchUp will do that natively with Export>3D Model.

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