Heart with slot on one side - Voronoi Style

This makes a great Valentines gift. There are three different variations of this heart: A, B and C. This Heart has a slot on one side to put something into it: Maybe a little paper with a message to your loved one. http://youtu.be/83wFYNWB1AI The Heart without slot can be found here: http://www.thingiverse.com/thing:246864