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    I built this cat door and it worked great for about three months. That’s when one of my cats figured out how to hook her claw between the flapper door and the housing to pull the door inward. (The cat door has a plastic U-shaped bit that’s supposed to mind the gap, but the cat can just pull that inwards too and get her head between the U-shaped bit and the flapper door.) I recommend adding an additional servo and a magnetic switch that’ll prevent the door from opening inward if the U-shaped bit isn’t closed. (That is, the magnetic switch detects that the U-shaped bit and the flapper door are touching, which is the case when a cat enters from the outside.)


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