Parametric Yo-Yo

Print various shapes of yo-yos using the OpenSCAD script. Both "Imperial" and "Butterfly" shaped yo-yos may be made.

The shape of the yo-yo halves are based on an ellipsoid, formed by scaling a unit radius sphere, using different scale factors for the z-axis vs the x-axis and y-axis.

Faces are formed in the ellipsoid by differencing cubes, offset from the xy plane, from the ellipsoid.

A hole for the yo-yo axle is formed by differencing a cylinder from the modified ellipsoid.

All the parts and assemblies are translated so they all sit on the XY plane, and centered on x=0, y=0, except the x-sections.

There are also options for cutting a pattern into the outside faces, making large cutouts into the outside faces and cutting voids into the interior of the yo-yo halves. Both the cutouts and voids are meant to be used to vary the moment of inertia of the yo-yo.

Axles can be either printed or cut from wood dowels, metal rods, or plastic rods.

Yo-yos can also be render