It's all open source! While it's not linked from the shop page for some reason, the file is at https://github.com/espruino/EspruinoBoard/tree/master/Bangle.js
While I'm not aware of other laser cut designs, there are two 3D-printable cradles at https://www.thingiverse.com/search?q=bangle.js
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
It's all open source! While it's not linked from the shop page for some reason, the file is at https://github.com/espruino/EspruinoBoard/tree/master/Bangle.js
While I'm not aware of other laser cut designs, there are two 3D-printable cradles at https://www.thingiverse.com/search?q=bangle.js