Inspired by Fidget Spinners I created a toy for our cats.
The boxes can be filled with food and the cat has to rotate the axis to get the food.
The food is ejected by the centrifugal force at one side of the box.

You need to print:
1x base
1x axis
2x box
2x cap

Additionally you need a 608 ball bearing (22mm OD/ 8mm ID).
That are those ball bearings used for the currently famous fidget spinners or for in-line skates.

There are two versions of the base. Chose the one you like.
You have to insert the ball bearing at the top of the base and then to attach the axis.

There are as well two versions of the box that snap in at the end of the axis.
One is with a 10mm opening, one with a 15mm opening.
You can chose that one that fits best the food-size.
Nevertheless the amount of ejected food can be adjusted by rotating the box in the snap-in.

The cap is the same for all boxes and will be screwed together to the box.
For training the cat you may leave them away so the cat can see that there is food inside the box.
(the base was stable enough when our cat tried to get the food from the top of the box ;-) )

Additionally the snap-ins of the axis has a few holes.
These are intended to tie some additional cat toys, e.g. a feather.
This may motivate the cat to play/rotate the toy.

Update 2018-08-20:

• added 150mm-diameter versions of both bases (as well the hight is lower)
• added a shorter axis for the 150mm-diameter bases
  (not testet by me - it was a user-request to have a smaller version)