If you often get an STL or X_T file, then you have to run specialized software like Solidworks every time to just watch it. Waste of time.
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Jiga 3D CAD Viewer for Gmail helps you view 3D CAD model files directly in Gmail.
After installing the extension, the View on 3D button will appear in the letters of CAD files . Clicking on it will open a preview of the file with the ability to rotate the image.
Supported formats are stl, stp, prt, slp, sldprt, step, ipt, 3dxml, sat, obj, iges, igs, x_t.