I made this with the idea that it can hold emergency cash or credit cards. The idea, (instead of freezing your credit card in a block of ice) is that it should be easy to get money and cards in, but very difficult to get them out to use. There are inside lips that should prevent items from coming back out. You could also superglue it or drill a hole at the end to install a luggage style padlock. I was going to make holes on the face to reduce print time, but I didn't want to be able to see the credit card numbers. I have not printed yet as it will take a while in it's current form. If you use supports, there would be considerable clean up. Feel free to improve on the design. I would like it if you actually had to physically break it to get contents out. That way you will think twice before using. It could be given to a teenager for an emergency so you'll know if they've been in it. I uploaded several different files from Cura and Fusion 360 because I am new and not sure which is best. I did not see a "save or export" .stl file option in Fusion 360. Please let me know the best file format to upload to thingiverse from fusion 360.