3D print service Shapeways has re-announced their ceramic service. They've long been known for experimenting with different materials in their 3D printers and now offer what is probably the widest array of materials to choose from when using a 3D print service.
As is their habit, they typically offer a new material experimentally so that they may learn how to do it just right. Earlier this year they brought in ceramics capability and now they have improved the results significantly. Just take a look at their before and after images above (click for higher detail). The left image looks just a tad wobbly, but evidently this has been solved by perfecting their glazing step.