Empty Box
thingiverse
The Empty Box of the Cat Hook, after you printed that you can fit in there the mechanism with attack or some tipe of super glue
Download Model from thingiverse
With this file you will be able to print Empty Box with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Empty Box.