The new wheels showed up today. I'm VERY pleased with the way that the centers turned out. As for the sleeves, I made a slight error when I designed them, and they are WAY too small. This wheel center was printed in shapeways Frosted Ultra Detail material, and is very nice IMHO.
Here is what it looked like when it came out of the box, semi transparent
A coat of primer applied
Then how it looks under the car