Going a little bit beyond what Customizer allows for with Emmet's original Stretchy Bracelet, here are two versions, one with a smoothly curved edge and the other with five ridges. I liked the contrast between the two, and the smooth one goes nicely with the original textured version. Print these the same way as the original. The best way I've found is to use a recent version of Slic3r with spiral vase mode, remembering to reduce the number of bottom layers to zero as well. Or you can manually select one perimeter, zero infill, no top and bottom layers, no solid layers and no extra perimeters.