This customizeable cuff bracelet is simple and elegant. It is also perfect for further decoration via painting, applying fabric covering, or gluing things onto it. The STL is for a 60x70 mm bracelet which is pretty average. Use the customizer if you want to shift the shape or size around. Note writs are oval not round! Scaling the STL will also work, particularly for minor adjustments.

No support is needed to print this. You may need to print it in ABS if you need to stretch it much to put it on. Print it with a lot of infill to make sure it is nice and strong. There may be some deformation on the lower curved surface. It can be cleaned up easily with a little sanding or filing. If you don't want to use the customizer, you could always just enlarge or shrink the STL.

Note the sizes on the STL are for the outer maximum diameter of the bracelet.