From jclymer01 on Thingiverse:

These are the STL Files for an RGB Arduino Clock I made. I included the wiring diagram and source code for the Arduino IDE. The clock is modular and prints in seven different pieces. The clock face was designed by one of my students.

The clock works as follows:

Blue – Hour hand

Red – Minute hand

Green – Second hand

Yellow – Minutes inbetween the five minute intervals

Read more and check out the video below from John Clymer on YouTube

Every Thursday is #3dthursday here at Adafruit! The DIY 3D printing community has passion and dedication for making solid objects from digital models. Recently, we have noticed electronics projects integrated with 3D printed enclosures, brackets, and sculptures, so each Thursday we celebrate and highlight these bold pioneers!

Have you considered building a 3D project around an Arduino or other microcontroller? How about printing a bracket to mount your Raspberry Pi to the back of your HD monitor? And don’t forget the countless LED projects that are possible when you are modeling your projects in 3D!

The Adafruit Learning System has dozens of great tools to get you well on your way to creating incredible works of engineering, interactive art, and design with your 3D printer! If you’ve made a cool project that combines 3D printing and electronics, be sure to let us know, and we’ll feature it here!