Little box in the shape of a question mark.
thingiverse
My brother in law didn't know what he wanted for his birthday. I didn't want tot spend a couple of euro on a gift card with some money so I decided he'd get a small box with the money in it Instructions Print it, when done insert object of interest and close it. The fit is quite snug so don't force it to much. In the case of a birthday gift and you feel really annoying, add some glue or acetone with the closing.
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