Dragon Egg Coin Bank

I hollowed out my dragon egg: https://www.printables.com/model/365443-dragon-egg and added a coin slot. 

The two halves fit together with a press fit.

The whole thing should scale okay if you want to print it larger or smaller than I did.

I also added a screw top version. This doesn't scale (or even fit) as well but I wanted the option. Someday I'll get better at 3D printed threads.