This safety plug is used to blind powersocket without built-in blinds. It mainly protects small children from contact with dangerous voltage, and it just as easily prevents unauthorized use of the socket.
Designed for socket type E (used in the Czech Republic), but the model should also be compatible with types C, F and K.
PLA can be used as the material, but PETG (or similar) is ideal.
If you run into a problem, please let me know.