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The other alternative is to have them printed in "castable resin" basically a lost-wax equivalent and then send the "waxes" to a jewelry foundry to have them cast. In my experience this is far far cheaper than the direct print to metal services such as shapeways. Shapeways does have its place, expecially for small one-off parts as Chris mentioned.
Shapeways gave me a quote of around $100 for a single top & bottom set in bronze. That x 9 is some serious cash (at least for me). These are, basically, thin wall tubes. Were I to get these cast I’d need to supply the core, yes ? I suspect I could get these out of Alibre by modification of my parts. I would think casting these as thin wall tubes using a core would be difficult and thus expensive. Again I have no experience with this.