Video of the working cup: https://youtu.be/1PWw9oxH5Ds
This is one of two Greedy Cups I've made based on the very popular "Pythagoras Cup (Greedy Cup) filled with Mercury" YouTube video https://youtu.be/ISfIT3B4y6E
It turns out I wasn't quite original in potsting it here but I think my versions would stand out. They'll completely empty out in 8 seconds (as you can see in the video) and I've payed some attention to aesthetics ;-)
(i'll upload the second Greedy cup a few days later)
You may want to scale it down a bit, though when you take it too far it might not work. It has mostly 3 mm thick walls so there should be some room for scaling though i'dd recommend checking through the preview layers to be sure.