A small, flexible version of the original door latch to allow cats through while keeping dogs out.
A print profile has been provided for Bambu printers. You will want tree supports (auto) that do not exclude small overhangs, only on the printer plate. I also used a brim as it's so thin. This was printed on its side.
The author remixed this model.
After using the original latch for some time, my wife and I have broken it a few times by walking into it. Since we only use the first slot, this has been made a lot shorter. Additionally, it has been made thinner to allow bending without breaking.