Hull and Minkowski operations sort of allow one to do this sort of thing, but add to the mathematical complexity in what is probably the worst-possible way....
I've had better luck telling it to use CadQuery. Here's an example where I stumbled around a bit, but was successful in creating a cat food container (Sheba Perfect Portions) dispenser
I don't think "obvious" is the right word here. It makes perfect sense when you understand it, but it's not a conclusion that most people could come to immediately without detailed, assisted study.
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