I don't normally do 3D design or manufacturing. Many years ago, paid some 30k to a design firm to design a load of injection mouldings and these are still running after 30 years! As I said, they gave us STEP or IGES files only. The injection firm has done mods to the tools but they just did it internally.
This project is a one-off. It is like a diecast box with a DB25 hole at one end. Someone offered to do the design for free but for some reason is taking ages (many months) to finish it, so I will try to retrieve it and if necessary find somebody on freelancer.com to finish it. Then I need a viewer, which the free Fusion will do for sure, and probably I should find a machine shop to make the CNC thing, hence I want to be sure the free version can do that. Otherwise the whole exercise is pointless because I don't have the time to learn Fusion from scratch.
I happily buy software I actually use but paying for the full version would be a waste of money in this situation.
According to google, free personal use version of Fusion 360 allows you to export designs in a variety of formats including .f3d, .3mf, .ipt, .iam, .dwg, .dxf, .fbx, .igs, .iges, .obj, .sat, .skp, .stp, and .stl. You can also export sketches and flat patterns as .dxf files. The specific formats available for export depend on the context, such as exporting from a sketch or flat pattern.