Remix of https://www.thingiverse.com/thing:4708158. Didn't need this for propping a door for the litter box, but to keep all doors around the house cracked open enough to let the cats in and out.

Mirrored the arm so you can print based on your door swing. The point edge of the swing arm should be towards the door stop trim on the door jamb.
Also lowered the height and elongated the pin on the door mount "spring" so it holds better. Added some grip flaps on the spring to allow you to "unlock" the swing arm.

Did not use a CAD program. All edits/modifications were done on Orca Slicer.

Creality

Ender-3 S1 Pro

No

Yes

15%

PLA

I use the Normal/Snug support with 4 top & bottom interface layers. Works for me for easier post-print clean up.