Gboard Kurukuru Version

Gboard Kurukuru Version is the 15th entry in Google Japan's Gboard keyboard project series. It is a conveyor belt keyboard in which four rotating belts, each carrying 29 keys, pass beneath the user's fingers, allowing every character to be reached without moving the hand. The project is not sold commercially, but Google has released STL files, firmware, and a build guide on GitHub so anyone can build it themselves.