The famous pythagorean cup has a central syphon that drains out all the liquid if a maximum threshold is crossed. We adapted it into a mug that hides the syphon inside the handle. This version was modeled in FreeCAD, version 0.20. To learn more about the pythagorean cup, visit https://en.wikipedia.org/wiki/Pythagorean_cup
The author hasn't provided the model origin yet.