A toy ship that should fit most wood train container types (old/new Brio and knock-offs). I kept the design simple to fit the wood-built aesthetic. It's an easy print and excellent to get rid of small filament leftovers. If you don't have a multimaterial unit, you can still get some nice patterns with manual color changes. No supports required.
There are two cavities where you can optionally place some weights if you pause the print at 8mm (d = 15mm, h = 7mm, I used M6 nuts). The weights just make the print feel a bit more toy-like and substantial. Feel free to mod, I'm including the OpenScad design file.
Obviously this will not swim.