Non-regular wheels (Reuleaux Polygons)

thingiverse

Reuleaux polygons are unique in their ability to maintain constant width, allowing them to roll smoothly between two rulers without changing parallelism. The diameter of these specific shapes is 40mm and they complement the regular Reuleaux polygons available at http://www.thingiverse.com/thing:61275. You can find a tutorial on crafting non-regular Reuleaux polygon shapes using Inventor at http://wp.me/p3gI7M-1E, so give it a try and enjoy the experience!