Pythagorean cup
thingiverse
The Pythagoras Cup has many variants. This type is nothing special. I recommend printing it with a black filament and transparent. First, pupils / students can observe the interesting Black Cup behavior. Subsequently, in a transparent filament glass, after filling with water stained with a food color, it will see a hint of the suction system inside. Finally, I recommend using the half-cup model: <a>https://www.thingiverse.com/thing:3294486</a> where the internal arrangement is clearly visible.
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