Child Safety Outlet Cover / EU, SchuKo

This is a cover for european electric outlets, also known as SchuKo or F-Type plugs. You put it into the outlet to prevent anybody from putting they fingers or small objects into the electrodes. Use at your own risk!

I wanted to make a child safety cover with the following design goals:
* Complete coverage of the electric outlet pit,
* No other tools than an electrical plug needed,
* Twist left and pull to remove,
* Minimal filament use, while not sacrificing necessary stability,
* Minim