Socket "E" - child protector (with key)

thingiverse

It's a straightforward child safety socket cover designed specifically for European sockets, which feature a grounding pin as shown in the accompanying photos. To take off this cover, you'll require a special key. Although compact, it possesses sufficient strength to get the job done. To use it effectively, print out the key vertically as depicted in the photos. The cover must be printed using ABS material so that it remains flexible enough to securely grasp the grounding pin.