NEMA (extruder) motor rotation indicator (Prusa MK2(S)/MK2.5/MK3/MMU2)

I always like to see what is going on with my printers Sometimes I wonder what movement the extruder motor is making extruding retracting slow fast etc which is not always so visible on the Prusa i3 MK2 MK2S MK25 MK3 ...