Another to?

 From:  WillBellJr
689.2 In reply to 689.1 
Good MOI Quiz! (Perhaps Michael should throw some together like this also to teach us best practices with using MOI!??)

I see perhaps a curve revolve for the bottom part and obviously a donut for the ring portion I'm thinking sit the donut down onto the revolved surface and boolean? But I don't believe that would give us a smooth connection between the two - perhaps a blend between the edge of the revolve and the donut somehow? (The revolved edge copied and projected onto the bottom of the donut which is then trimmed and blended???)

Good question - I'll definitely keep an eye out for the answer! ;-)