Mark McBride is the guy who invented modern 3A yoyo play (that took off pretty well), was the first person to create a notation system for yoyo tricks
Riot Mouse is basically like having your own personal modder at your disposal…you create your ideal yoyo via a fairly simple web interface, specify the material you want it made of, and plunk down your money…and in a week or so you get your yoyo in the mail. The plan seems to be to create yoyos from standard materials (maple, delrin, aluminum) as well as a variety of exotic and novelty materials (bone, composite plastics, a chunk of wood from The Man at Burning Man, etc). Sounds like a neat idea, and with the slow rise of 3D printing in yoyos it’s nice to see someone taking the idea of tabletop manufacturing to the next logical step.
Head over to Kickstarter for more details and to support the project. Good luck, Mark!