Yes, shapeways accepts paypal. Shapeways 3d prints in wax. The wax is then submerged in a plaster like slurry. After the plaster dries, the wax is melted, leaving a mold of the ring. Then they melt brass or what ever metal you have ordered, and inject it in the mold. This process is called lost wax casting, or investment casting, and is centuries old.