The #3DBenchy model usually capsizes in water, but I found that with the right slicer settings, it will actually float upright: https://www.thingiverse.com/thing:6076719
The #3DBenchy model usually capsizes in water, but I found that with the right slicer settings, it will actually float upright: https://www.thingiverse.com/thing:6076719
Benchy was not designed to float. An STL file only defines the external geometry, but if you print it with default slicer settings, the density will be relatively constant throughout, and the resulting center of gravity is too high and too far forward to function as a boat.
In order to make it float, I put more mass at the bottom/rear and less at the top.