I made this charm as a Valentine's day gift for my wife and daughters using Tinkercad. I made a heart shape, then copied and resized the shape to create the staggered shape. The 5mm hole is intended to fit a standard Pandora style charm bracelet.
I didn't use supports, so the steps on the bottom side are a little less pronounced, but it still printed nicely. I used a Printrbot Simple Metal without a heated base.