a customized padlock with a key
2 chassis(demo and normal) demo has a hole in the front for demonstration. normal does not.
simple installation and fully printable.
edit: fully functional
the tumblers go in from left to right on the Y axis
most of the internal parts including the key will need minor sanding(the tumblers will need lots of sanding) but youll want to judge how much you sand based on your print detail.