3D print a functional wrist watch with quartz movement.
This project aims to build a thin, flexible smartwatch. It's wrap-around display and touchscreen will allow it to display more data at a glance than current devices.
Chronio is an Arduino-based 3D-printed Watch. By not including fancy Wifi and BLE connectivity, it gets several months of run time out of a 160mAh button cell. The display is an always-on 96x96 pixel Sharp Memory LCD.
AsteroidOS is an open-source operating system for smartwatches, built upon Qt 5.8 and QML with OpenEmbedded and libhybris.