Pet cage door stay

I want to be able to keep the cage door open enough for a new puppy to enter and exit but to keep out an older boisterous dog.

Hopefully this door stay will do the trick.

The stl is suitable for the cage I have but the scad file is parametric and can be easily modified to produce stays that should fit any wire cage.

If you edit the scad you could even use it as a cable or pipe clip!