I'm working on some small parts, and I noticed a difference between what the part looked like in my CAD application/Netfabb, and the rendering that was generated when I uploaded the part. 'Part in Netfabb' shows what I've designed. The surface is smooth: 'Shapeways import' is a screenshot of the product upload page. Note the rough surface: Initially I thought it might be a problem with the STL export from Netfabb, but when I re-import the STL into Netfabb it still looks smooth. Same when I import the STL in Meshlab. Stranger still, I've uploaded several versions of this part. Some are rendered smooth, others are rough, but I haven't changed any settings between uploads. The uploaded part is here I've attached the STL.