Inside the robot. The black L-shaped part is suction mechanism. The blue helix shape is sorting part (see detail below).

   
One of many electronic boards.


One wheel with gearbox, encoders and motor and some electronics.


Sorting mechanism - pingpong balls are dropped on the top, where a latch select their destination. Either the fall through white tube straight down, or they travel on the blue helix structure around. This structure works also as a storage area for balls.