NEMA14/17 axis wheel 32mm / 20mm

I wanted to manual control the Z axis of one of my printers and also be able to view easily Z axis changes. So, as this printer had a NEMA14 motor for the Z axis I designed this small wheel to acomplish that task with a double axis NEMA14 motor (it fits also a NEMA17 axis). First designs had some holes to make it look cool and lighter. But as this part had stress from the M3 screw/nut pressing firmly the motor's axis those parts broke when I tightened the bolt. Not happy with this results I ripp