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I agree and if can you wait, I will be uploading one on Cults3D which not only has a slot but will also have a threaded stopper for easy coin retrieval. There will be a small charge for the piggy bank version (99 cents) but hopefully this isn't too bad:-).

If you decide to make your own then that is fine but do bear in mind, the license prohibits you from uploading and distributing your derivation and it will have to be kept strictly for personal use.