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That's nice. I did something similar. By the deadline, I ended up just having shapeways cast my STL files. Ring is very nice, even if I merely designed it in OpenSCAD.

I did manage several failed castings.

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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

That's great! They will also print in gold if you ever want to upgrade. I had a backup printed recently, after 7 years, and it's exactly the same as the original. I was worried about process changes or tolerance issues, but had none.

In this case, I really like the silver/black contrast. I actually had a prototype pinky ring for years that was just aluminum and carbon fiber (lathe-made). The aluminum is whiter/less shiny, so an even starker contrast.

(I really need to pull together pictures of the process/design some day...)

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