Here is a smart 3D printer with WiFi designed with kids in mind. The Tina 2 Mini 3D Printer is compatible with Cura, Simplify3d and Slicr3r slicing software. It comes with auto-leveling and a bendable platform. It measures only 210x210x290mm inches. You can control it with Poloprint Pro for iPhone and Android.
This printer has USB, TF Card, and WiFi modes. It has a build volume of 100x105x100mm.