Window lock

thingiverse

This is a clever window lock that keeps your windows securely closed from the outside whenever you need it. I created this solution because my own window would often swing open unexpectedly while I was outside, allowing the cold air to pour in. No screws are required - simply insert the piece into the window gap when needed, and it will keep your home cozy and warm for up to 15 minutes or more, depending on the situation.