Here's a tough one for you:

An alternative to AutoDesk Fusion360 for 3D print modeling.

Ideally with native Linux support but I'm more concerned with getting out from under AutoDesk's thumb than I am with using wine.

Blender seems like the obvious choice, but it's not really built for 3d printing.

It's looking like FreeCAD may be about as good as it gets unless someone here has some other suggestions.