trick glass

this glass will dump it contents if you attempt to drink from it (or if you fill it too high) trough a siphon.
though it does not do this very fast, maybe I'll add a foot to it so it'll go faster, like the "Tantalus Cup".

the image is an x-ray view so you can see the internals (screenshot in cura)

the solidworks file is fully parametric you can set the amount of tubes in the wall, the thickness of the tubes, the wall thickness, the height, bottom radius, top radius and possibly more.

I might have made it a tad bit big ish...
So feel free to play around with those parameters (if you have solidworks)

EDIT:
updated to a new V2 solidworks file and added a smaller (also thinner walls (0.7mm) and thinner airGap) STL V4 based on this file.
I'll remove the old solidworks file as one of the dimensions isn't driven by the formula as I had intended.