Sometimes this can be done by simply trowing them in a funnel and let slots of different sizes sort them. Just like those coin sorting machines. But in your ca

Sometimes this can be done by simply trowing them in a funnel and let slots of different sizes sort them. Just like those coin sorting machines. But in your case a sorting conveyor belt could be the easiest way. The right items are pushed off the belt at the right time. Edit: an example: https://www.youtube.com/watch?v=Ajxs6_V8KJM https://www.youtube.com/watch?v=Ajxs6_V8KJM And by the way: if you got 50 unique items it doesn't mean you need 50 slots. You can also create 10 and repeat the process for the unsorted items. But you need to reprogram the system each run.