I'm from Portugal, this is a keystone of my childhood, don't know if you also have these in your country, comment if you do, I would love to find out if this is an exclusive Portuguese thing. But basically is nostalgia just for the fun of it, Use it as a Vase, a pencil cup... a glass (really?), whatever, whenever.

You have access to a single print file, or the object divided in two with guides for glueing it later for a water proof experience.