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
For convenience in setting the time, there are push button switches to advance the minutes and the hours.
The male female connections came out pretty well for me when I printed the modular pieces. However, the end of the clock did not stay together as hoped. For that reason I used glue at the end of the modular piece, near the holes for the LED. I will work on creating some clasps so that the ends do not need to be glued.