I needed a simple latch that could be engaged from both outside and inside a chicken run door. In my case the run is large and has 2 doors on opposite sides. Now with the latch I can enter one door and leave out the other without pre-unlatching both doors.

I figure this could also be useful for other gate or garden doors, wherever you just need to drill a hold in a wood panel and have it pass through. Consider scaling it up for anything that's meant to keep out/in something larger than a cat as the threaded section has broken a couple times until I printed the threaded part of the bolt piece at 100% infill. Also not sure I would trust the latch arms to hold up against a person or dog pushing against it at it's current scale.

This is still a work in progress as I'd like it have a more secure latch. You can see I still have the old metal latches as backups. An animal climbing up the outside could purposely or accidentally lift up the main bar of the latch. I'll probably just add a spring to the door in case that happens just to keep it from swinging open.

No

No

.3

75% / 100% for threaded area of bolt

I originally created the latch to pass through about 2 1/4" thick door. In my pics you can see I had to carve out a bit of the door as that was not deep enough. I made a long version of the bolt and sleeve which can pass through a 2 5/8" surface. If there's enough demand I can make one that's even deeper. The latch will function even if the non latch end protrudes past the depth of the surface it is passing through.

There are also left and right versions of the latch arm based on which way your door swings and how you want to place them.