Here is a cool robot arm that can pick and sort LEGO parts by size. The Mysterious Gear Sorter Robot can measure the number of teeth of the gears. You can build it using parts from a single LEGO MINDSTORMS Education EV3 set 45544. The below video shows how this robot works:
More like this ➡️ here
Mysterious Gear Sorter
The good news is you can buy the building instructions here
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