The driving grey pulley transmits rotation to the blue shaft through a friction clutch.

Tooth number of the blue gear Z1 = 30.

Tooth number of the green gear Z2 = 32.

The shaft can rotates around 15 turns (= Z1(Z2-Z1)) until the moving stoppers (pink and yellow) collide each other.

There is no need of large trasmission ratio of gear drive as said in video Shaft rotation limiter 3