Bottle Top Whirlpool (UK size)
cults3d
Couldn't find a model for this, so made one myself. This will fit a standard bottle top in the UK, or any size with a little trial and error. I'd recommend testing the bottles screw on completely before filling one of the bottles with water, and if possible a little food colouring and a sprinkling of mica powder to really see the energy within the whirlpool! I've tested with a smaller hole and it started glugging instead of forming clearly, so this is basically a straight tube connecting the two bottles. Here's a vid of how its used (vid not mine) https://www.youtube.com/watch?v=5E9v7BqIxgs
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