This is not what it looks like! Or maybe it is, if you like it that way. If you look from the top, you will see a heart though.
The thing was an actually an experiment to make a single walled vase with a thicker lip, but the curvy shap was a find too good to pass.

I printed this with Cura, 1mm wall, 0.8mm nozzle (you might get away with that setting without actually having a 0.8 nozzle installed), 0.4mm layer height, 6sec min layer time, 1.2mm bottom, no top and 'joris' enabled. (last two settings in expert). I rotated the curvy part towards the fan as you probably want the least defects there... :)