I believe these are made with object printers, and the highest resolution listed by objet is 28 microns. Not sure if that is what Shapeways uses, but I'll check.The Mad Moder
michael@shapeways.com
FUD is 800 layers per inch, which means 31.75 micron thick layers, printed with 3DSystems' Project HD 3000.
Objet Connex 500 machine is used for White, Black and Transparent detail, and run in 30 micron fast mode (there were some tests with 16 micron detail mode).