because 3D printers have their own constraints in things like the overhang that they can do.

That’s what supports are for. :) In my case I made a custom sprue because autogen supports sagged unless it was 0 clearance.

I was just looking for something like a rectangular prism or cylinder to fit in a cube. I was surprised by the replies that it’s mathematically hard. I expected it to be a geometry problem with a bit of calculus to find the convergence.