[MrLee]

This style omni wheel would be a more challenging to manufacture and assemble, as the outer rollers cover the inner rollers, this is most likely why we do not see them in production currently. As most current omni-wheels are injection molded plastic, the process for molding a wheel of this shape becomes significantly more challenging, due to the angles you see in all of the pins.

A normal injection molding process of a simple part features a 2-part mold. This requires that all faces of the part can be directly accessed by the two faces of the mold.

To mold a wheel like this, you would need several extra moving parts in the mold, thus driving up cost.

Also, due to the shape of the wheel, each roller is, in a sense, cantilevered from the main hub. If you think about the shape of the hub (without the rollers) there is a lot of pressure riding on very little material.

Benefits, however could be a smoother ride when you do not have to deal with the gaps in the standard style omni wheels. In addition, you could achieve a dualie-effect without the space taken up by having 2 wheels side-by-side.

For the sake of cost and simplicity is why I believe that we do not see designs like these already in the FRC market.