This is a low-poly heart keychain/necklace! It is a quick print that you can batch manufacture and sell for at least $10 in my opinion. You can also scale these down to 52% with 5x2mm magnets to make earrings! I will link the materials and settings I used below. For the filament, I used BambuLab Red Sparkle. Setting: 0.4 nozzle, 3 walls, 10% infill, standard supports on.

Magnet size- 10mm wide, 3mm thick- https://a.co/d/4dDvzUS Keychain Rings- At least 1 inch- https://a.co/d/emDug3w