I designed this test piece to see how small features, angles, curved surfaces, etc. perform in various materials. I originally designed it to check the stainless steel printing, but it should be a good print-quality sample for any material except the ceramics.
The pics I've uploaded are from a "white, strong, and flexible" print I just got. I'm pleasantly surprised with the detail and how small the stepping effect is!
For a detailed look at what all is being tested in this piece (0.5 - 3.0mm radius, 0.5 - 2.0mm groove, etc.) take a look at my original drawings: http://www.beowulf-recording.com/download/Shapeways/test-sample_import13.pdf