Oloid Models: They roll and feel great to the touch.

Two interlocking circles, whose centers are on the perimeter of each other, make a rolling object that is called an oloid. The oloid has some interesting properties. If we imagine a line that is tangent to the flat surface it rolls on, we have a convex hull, a 3D oloid, which is playful.

This design focuses on the basic ideas behind an oloid. The two circles can be slided into each other. I have also tweaked them a little so that they will lock with a clicking sound. Two sizes are included: 50 mm and 80 mm in terms of the base circle diameter.

Also included are two whole oloids (50 mm & 80 mm), generated using the OpenScad hull() function, which can be printed with support or in halves.

References

1. https://en.wikipedia.org/wiki/Oloid
2. https://kitwallace.tumblr.com/post/85636282539/oloid
3. Paperfolding: https://www.polyhedra.net/en/model.php?name-en=oloid

No

No

0.15-.2mm

25-50%

1. After printing, snap the two circles together with a clicking sound. Then, let it roll.
2. To print the whole oloids, please use support, about 0.3mm from the model, plus a raft. It worked nicely in my experiments.