flow control  ( hack a  mouse's laser ) for Arduino I wonder if anyone

flow control ( hack a mouse’s laser ) for Arduino
I wonder if anyone could use this to alter the flow rate cooling temp etc… of filament. This guy hacked a mouse’s laser with Arduino. Perhaps it could be used at the hot-end to get precision feedback on filament layering.
https://www.youtube.com/watch?v=bci7Gi05BNc&feature=player_embedded