I really like the original authorWaterfall ring (butterfly) from user_2404380810 - MakerWorldThe waterfall butterfly ring andWaterfall Ring - Cherry Blossom from Zuo Zongtang's Fish - MakerWorldThe cherry blossom waterfall ring.

I redrew the opening ring holder. The opening is 5mm wide, which makes it easy to use a lighter to heat and finely adjust the size.