You will need:
2 Big Gear 1
2 Big Gear 2
2 Small Gear 3
2 Small gear 4
1 Heart
8 connectors (try the file named "connector" first)

There is also a File named All that has everything you need on it.

Print settings:
I used a brim, but you can get away without one if you like to life risky.

Assembly:
Watch this Video: Watch the video

Troubleshooting:
The pins Break: Try scaling them. I did include a couple of different versions. Try them all. You can also try printing them with another spool of filament. Maybe even another Material. As a last resort, scale the Connector in your slicer untill it fits your needs.