This awesome DIY Chronio Arduino smartwatch which is housed in a 3D printed case may be just the solution.

The Arduino watch has been created by Alessandro Matera and can be seen in action in the video below complete with 3D printed case that was created using a desktop 3D printer.

Squeezed between the display and Raspberry Pi there's also a real-time clock, an Arduino Pro Mini, a USB to serial cable, and a power-management board.

In this case, the 3D printer used by the Nixie clock project is a Prusa i3 (which is the same printer used to make the original Nixie tubes).