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Simple pyramid shaped piggy bank.
Print as is, no support. If printed with support they will generate inside a bank making it inconvenient to use. Coin opening have support build into model.
In order to access money you need to break your print open, that prevents you from stealing change out of your saving piggy bank.
I design it so I would have biggest piggy bank that I can possibly print on my printer without making it two or more part. This print does not require to support its roof (otherwise I would print a hollow cube) and because of that is very efficient for that purpose.
Also if you fill it up you can print another one and when you will have 10 of them filled they can stack quite well (one normal, one upside down, one normal, one upside down). :D