I also used shapeways and CAD (Solidworks). Printed a steel one first (cheapest metal), then iterated and did a brass one, finally a silver one. I got a spare silver one made as well.

Then I did a wrap of unidirectional carbon fiber around the ring in a designed-in groove. Wrapped some 1" ID silicone tubing around the ring, held in place by a cable tie, and stuck it in the oven at 300 for an hour. Carefully trimmed the carbon fiber edges with a razor blade for a hour or two.

Ring's still going good after 6 years :D