I really liked the Capybara by YahooJAPAN (https://www.thingiverse.com/thing:182089) and my grandsons love Capybaras.
So I remixed this design into a money box for them and scaled it by 150% so it fits a resonable amount of coins (and paper money too!).
You can further remix it here:
https://www.tinkercad.com/things/6KC3vuL6LTY-capybara-moneybox
Capybara_MoneyBox.stl | 3.0MB | |
Capybara_MoneyBox_Access_Portal_Lid.stl | 115.5KB |