There are 4 files here, the complete heart file and 3 cut files. The 3 cut files are printable with little to no supports. Also the cut files are currently scaled to be approximately accurate to human scale. Each cut will fit on an Ultimaker 2go print bed. I printed using PLA, 0.1mm layers, with a 0.4mm nozzle. Use ultimaker filament and it comes out shiny and beautiful. Almost no post processing needed. I combined the pieces using friction welding (see tutorial here http://makezine.com/projects/make-34/skill-builder-finishing-and-post-processing-your-3d-printed-objects/)