These designs are printed in ceramic and then fired before glazing and the final firing. Shapeways has since discontinued ceramic 3D printing, and instead offers a much more detail option of porcelain casting from a 3D printed model.
FUDDLE - printed in ceramic
TORUS SLICE - printed in ceramic
5-inch RIBBED PLATE - printed in ceramic
5-inch RIBBED PLATE (bottom) - printed in ceramic
5-inch SCALLOPPED PLATE - printed in ceramic
5-inch SCALLOPPED PLATE (bottom) - printed in ceramic