Puzzle Teapot

This is my draft of a 'chinese puzzle pot' for an exercise in design class.
It has to be filled upside-down, while the fluid shouldn't run out, neither in this nor in its regular standing position.
Additionally, I tried to make sure it's printable without supports, even for 3D printers with low quality in bridging. My first miniature test print was in transparent PET, most common materials should work perfectly fine.