The mechanical display is almost entirely made of 3D printed components ... Evertyhing is controlled by an Arduino Mega, acoompanied by a DS3231 RTC and eight ULN2003-based stepper motor drivers.

Just when we think we’ve seen all possible combinations of 3D ... the clock code, or if you’d rather sit and admire the rainbow light show unabated by the passing of time, just use an Arduino ...