Summary

I created these pieces in tinkercard so that I could attach to my door to allow my dog to go in and out in lieu of cutting a hole in my door for a doggie door.
If you decide to shorten/lengthen this, the angle might not be great and you might need to tweak it a little.
In order to get the length I wanted, I needed to print the piece that attaches to the door in 2 pieces and then glue them together afterwards (door latch_door file). Although it's probably best to print with supports (I used tree), they're already oriented in a way that is ideal.

Door Latch_Door file has 2 pieces that should be printed with supports
Door Latch_Wall Mount does not need to be printed with supports
Latch Pin does not need supports. I printed this one with a little more infill % because I wanted it a little beefier.