The feeder can be used for fish food, shrimp food for cats, dog treats or any other application where tablets and granules are needed.The servo is a standard 9g servo. A Raspberry, Arduino or other servo controller can be used to control it. The diameter of the chambers is 12mm.However, I have attached the .step files so that the feeder can be adapted. The feeder is less suitable for flake food.Flakes can still be used when placing a fish tablet underneath. A push button can also be used to control or programme the servo. The button can be bought on Amazon.(https://www.amazon.com/Momentary-Spring-Return-Self-Return-Pushbutton-Switches/dp/B09DJY5Y5L/ref=sr_1_11?keywords=spst+mini+switch&qid=1660832883&sprefix=spst+min%2Caps%2C152&sr=8-11)You can use 1.75mm filament for the movement of the magazine. No more parts except the servo and controller are needed.