Most of my design work aims at creating new parts for the great fischertechnik construction toy system (
https://en.wikipedia.org/wiki/Fischertechnik), or making foreign parts compatible with it with adapters or enclosures. While this started as an instrumental project, originally intended to enable me to realize some advanced fischertechnik projects, recently I find myself spending most of my time 3D designing and printing while neglecting my original fischertechnik related aims. :-)
I'm always happy to learn if and how my work is useful for others, so please post your makes or leave a comment!