In the past couple of years, we have covered plenty of educational robots and electronics kids. The O Watch happens to be a 3D printable smartwatch based on Arduino that teaches your kids about 3D design and programming. It comes with various components and instructions to show you how to build your own smartwatch. You can customize your O Watch with 3D printed cases.
The O Watch kit will be available in two versions. The base watch kit has an Arduino board with a color OLED screen, LiPo battery, 3D printed watch-case, and para-cord kit. The smart version has a sensor board with axis compass, temperature, barometric pressure and humidity sensors. More information is available here.