this is my scope adjustment knob, it is a one pieced design so some thin supports are needed and should be "broken" after printing. For the short knob the coin should be cutted in half. A one cent coin should be added inside wich will make the adjustment rotate. The knob adjusts by preassure so a bit of teflon tape should be added to the thread to make it fit perfectly, i know it would be better with a thread in the design but the scope one is very week.