This is my design of a mechanical heart using the software HUEFORGE. Perfect for a gift or decor your room.

Please print at 0.08 layer height. The file also includes the .amf with all the color changes but also here you have the note:

Swap Instructions:
Start with Black
At layer #5 (0.48mm) swap to Dark Gray
At layer #9 (0.8mm) swap to Light Gray
At layer #14 (1.2mm) swap to White for the rest.