Original compliant cylindrical spring printed a little too well, I ended up recycling the idea for the Subtle heart ring design. Three size variants.

I can print in it in PETG with 0.20 QUALITY Prusa Slicer profile, keeping seams away from the heart, some adaptive thinner layers at the top of the heart, then retouched with acrylic marker. 

Did not manage to get it bridging correctly both on 0.10 DETAIL nor 0.30 DRAFT.

PLA plus some surface post process and finish could bring this to another level.