Complicated dog feeder puzzle, make your dog work for their food, your dog has to move the center key to be able to move the slider caps and expose the food.
The feeder puzzle hold about 20 grams of food, I recommend not leaving the feeder puzzle with your pets unsupervised

I printed this with 0.2 mm layer height in PLA with a minimum of 4 walls

M3 20mm and nut X 4
M4 30mm washer and 2 nuts