Ly Pythagorean/greedy kín đáo hơn (ít lộ cơ chế siphon)

In keeping with the classic greedy cup shape, but a less obvious suspicious looking centre piece, hiding the siphon mechanism in the cup wall. 

There are three options to choose from, version 4 has a higher syphon height and thicker walls designed on request of JeroenD.

Also see the classic version here: Classic Pythagorean greedy syphon cup by jattie | Download free STL model | Printables.com