My cat loves certain spices. Vanilla, marjoram, etc. That's why I made a rubber ball that can be opened, filled with spices and closed again.

Printing from TPU, it is necessary to print with the hole facing up so that the holes (1mm) are open. When printing the balloon diagonally, they are not open and the rubber closes them. The cat would then not smell the spices.

Of course, only fill with what your cat likes. But mine doesn't react to catnip.