A really simple model for your cockatiel, conure, etc. that should fit into any wall or cage corner. I used ½ inch Schedule 40 PVC conduit for my perch I made, but I included a file for a ½ inch wood dowel, if you wanted to use that instead. I also included a Fusion 360 file, so if you wanted to modify the perch for a smaller or larger rod/pipe, you can do that instead. All you have to do is go in and change Pipe_OD, and Holder_Thickness in the parameters to your liking. Works with M3 screws.
The author hasn't provided the model origin yet.