This is a modified version of one of Emmett's Heart Gears (2-3). I used Blender to split off about 5mm from the top surface of each of the 8 gears.
It's printing out now at about 50% size, and I already see some issues with the corners of some of the pieces. I didn't plan properly on support. When I get some time, I'll try to modify it again to include some built-in (hidden) support.
I'm printing this using Makerware Desktop in White/Pink ABS at 0.2mm layer height, 30% infill and purge wall enabled.