2L Bottle Vortex Connector
thingiverse
This is a fun little gadget that lets you create soda bottle whirlpools all day long. To get started, simply screw two 2-liter soda bottles onto the ends of the connector, and you're ready to roll. I'm not sure how soda bottles vary in different countries, but the popular ones in the US worked great for me. Depending on your printer's quality, you might need a bit more elbow grease to tighten the bottles securely. The device may leak a little if your printer isn't top-notch, but it shouldn't be a major issue. If you want absolute zero leakage and plan to use this thing forever, try using some glue to seal everything up tight and secure.
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