Here is a video that describe the new Save to STL option available in the 1.7.444 release of Fusion 360. Currently only solid or surface bodies will convert to STL so if you have a T-Spline body it will need to be converted prior to creating an STL. Here is the link.
Thanks very much for the information.
I see where it was moved to, and it makes a good deal of sense. It allows saving components rather than only full drawings. It would have been very useful for a design I did the other day.