You can see in the photo that the wall is just above the waterline. It stays in that orientation until you disturb it enough to spill water over the edge, at which point it capsizes.
That “slicer file is public domain” part would probably not be valid as benchy has a “no derivatives” licence:
If you remix, transform, or build upon the material, you may not distribute the modified material.
That overrides the requirement of “share-alike”, meaning you have to use the same license for remixed or derived content, as you aren’t allowed to release any in the first place.
Unless the creator has received permission from them, of course - that overrides all licences.
The technique can be applied to other models: Use PrusaSlicer’s ‘cut’ feature to break the model into parts, and tweak the settings (mainly infill and perimeters) to give each part the desired density.
(I mean, I do understand how incredibly hard and difficult that could be. which is kind of why I asked. I’d be very curious about how you implemented that process.)
It’s not rocket surgery. Boats need more weight at the bottom than the top. If you put it in water and it leans, shift some weight in the other direction.
PrusaSlicer has a ‘center of gravity’ indicator that removes at least some of the guesswork.
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