I have mostly run this in silk PLA. There is a pretty major overhang coming off the base at the beginning of the outer shell. Slow the printer down to 70ish percent until it gets vertical. Then you can turn the speed back up. The rest should be pretty straight forward.
The author remixed this model.
Corrected a couple of issues with the original design and added the option to have names and dates on base. This scale makes the heart about 6 inches tall. Scaling it 125% is a nice option.