Printables link. Apologies for the... very lazy select + background blur. In the land of windows I would have used paint.net, but I'm coming to you from a mac today and haven't found a great alternative.
this post was submitted on 12 Oct 2026
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Sorry to burst your bubble but these have been a thing since at least the 90s:
https://www.amazon.com/NANAOUS-Tornado-Bottle-Connectors-Cyclone/dp/B08HCWKM18
But if you mean "designed" as in "I didn't create the concept but I made this ground up in Blender or whatever" then hell yeah, that's awesome!
Oh, I know. I was a child in this era and wanted something similar for my kids.
I just wanted something that could attach to a more sturdy bottle as 2L soda bottles are... pretty flimsy when a kid is shaking them around to get a vortex to start.