I loved the original version of this heart, but wanted something solid, so I made adjustments to the model.  Plus I changed orientation on the build plate for what I believe is a cleaner print.  I've scaled it to be similar in scale to actual human heart.  Hope you like it.  Feel free to drop me a boost if you do.  My version is at 0.2mm layer height, and 5% infil, but feel free to adjust as you wish to suit your own needs.