Door Lock
thingiverse
Insert a lock that can be activated from within a room to secure the door from the inside. Slip a small cube-shaped component into the recessed area on the door frame, positioning it so that one of its sticks extends inward. Then, carefully push another stick through the first stick, creating a secure locking mechanism. This design was inspired by the following video: https://youtu.be/-lNFJt10w1E?t=2m55s
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