Overrun Clutch (Freewheel)
I wondered if it is possible to design and print a functional ratcheting freewheel mechanism, also known as an overrun clutch. So I came up with this design and it works as intended. I included two different types of freewheels. One where the "arm" has a thickness of 0.8 mm and the other has a thickness of 1.2 mm. This will give you a good feeling of how stiff the system will react when you vary the thickness of the arm, whilst leaving the other parameters untouched.
Since it works I will definitely include it in one of my upcoming projects.
I hope you enjoy this little thing.