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.

Dragon Egg Coin Bank

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Print profiles

Dragon Egg Screw Top.stl
⏱ time and weight estimated after preparation · 1 material(s)
Made to order: we prepare this file when you order, which adds a few minutes before printing starts.
Prints on: A1 mini 0.4PLA
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Dragon Egg Screw Bottom.stl
⏱ time and weight estimated after preparation · 1 material(s)
Made to order: we prepare this file when you order, which adds a few minutes before printing starts.
Prints on: A1 mini 0.4PLA
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Dragon Egg Slip Top.stlDEFAULT
⏱ time and weight estimated after preparation · 1 material(s)
Made to order: we prepare this file when you order, which adds a few minutes before printing starts.
Prints on: A1 mini 0.4PLA
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Dragon Egg Slip Bottom.stl
⏱ time and weight estimated after preparation · 1 material(s)
Made to order: we prepare this file when you order, which adds a few minutes before printing starts.
Prints on: A1 mini 0.4PLA
Order this print