I love playing with yoyos and designing them. You can look at some of my designs on the Yoyo CAD and Prototyping adventures page.

https://forums.yoyoexpert.com/t/hourglass-106mm-wide-3d-printed-yoyo-for-sale-27/418240?u=atomicchessguy

https://forums.yoyoexpert.com/t/pachyderm-yoyos/419424?u=atomicchessguy