This is a replacement crank handle for an Eiscolabs Wimshurst Machine.
The crank is made to hold an M4 screw in the through hole and retain an M4 nut in the recess. The results give a protruding thread to fit in the main pulley of the Wimshurst Machine.
It is printed with 1 shell, and 20% fill with PLA.
The author marked this model as their own original creation. Imported from Thingiverse.