The http://www.ponoko.com/make-and-sell/show-material/197-metal-aluminum#main-image link showed 40mil thick aluminum, which I think is probably too thick for fine pitch SMD. I’ve used http://www.4pcb.com/smtstencils/index.html multiple times and had good results. They even have a cool jig for double sided boards available. This would be more expensive than the vinyl cutter after about 10 stencils, but for a one off could be very economical.
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