Michelin Tires has been working on Research & Development for 3D Printed tires. Since I have a background in this I found this particually cool. Very excited to see the future of tires and how it will disrupt the "Rim" industry and what new industries and jobs will be created when we have majority of tires being 3D printed vs. not. The only downside currently is the cost to make 3D printed tires as it will be a long time IMO when the cost of rubber tires exceeds the cost of 3D printed tires.
For reference and more information see this article: