Just modified the bottom gear of the screwless heart gears to fit my old kysan DC extruder motor (which turns very slowly on 5V USB XD)http://www.youtube.com/watch?v=YefD_BvxgzYI'm excited to see other pepole try and print this! If you want the openscad file, let me know!Print this part, glue it to a motor of the correct size (37mm diameter 20 mm shaft) glue the shaft into the center of the heart!Take a picture of the heart Upload the picture here after clicking the "I Made One" Link(the following steps are optional) Take a video of the rotating heart Upload to Youtube(or similar free video streaming site) Post a link in the comments of the picture of your heart that you uploaded after clicking "I Made One"...? Profit!