Is a working spigot possible?

youmagine

I'd like to create a fully printed spigot for a rain barrel, but my first attempt is far from waterproof. I'm aware that adding rubber rings to 2 or 3 locations could make it functional and watertight, but I'm curious if others have a design using PLA with no additional parts. Feel free to start with my design or come up with something entirely new and different; a design using ABS is fine, but continuing to use PLA is preferred. More Information: I created a second design, Spigot II. It's generally the same, but it allows me to print both parts in the same orientation. I also made this design very tight on purpose, too tight. I printed with the tip hotter to allow for better adhesion between layers. I sanded things to make them smooth. In short, despite printing and sanding, the thing still leaks when the spigot is closed with minimal pressure, causing water droplets to fall.