Scotch Yoke Fidget Toy (Print-in-Place)

This is a print-in-place model of a scotch yoke mechanism - a device that turns rotational energy into reciprocal energy. This device was integral in many industrial-era machines, such as windmills, actuators, and crude metal shaping machines. 

Please be advised that you will need to free the roller from the base of the toy. Because it is print-in-place, it will print lightly fused to the bottom and sides. It required a good amount of force for me to free it, but it will depend on your filament. Also, the shaft of the yoke is intentionally long and thin, as you will need to gently bend the shaft to thread it through the holes and around the cam. Lastly, make sure that you print this in 0.1mm layer height, as the gap between the cam and the base is 0.1mm. If you print with a 0.2mm layer height, they will fuse inseparably together. 

Also, a light spray of a 3D-printing friendly lubricant will go a long way in making sure the toy moves smoothly.