This is a Voltrega compatible cage hook I had to design since my degus tend to eat every plastic part of the cage but ignore the 3D printed pieces.

I know this is compatible with some Birds and rodents cages but not all of them, the reference for the original hook is 0108925, you can see in the Voltrega catalogue if it is compatible with your cage:

http://www.voltrega.com/files/CatalogoVoltrega.pdf

I've printed it with the orientation you see in the last image to make it more resistant to traction forces. You have to use supports if you print it with this orientation.

There are more cage related designs in my profile you could be interested in, check it out.

Any feedback would be appreciated.