Hmm, that's odd. Obviously I have no control over the printing of the item, but have you spoke to Shapeways customer service? There's always going to be SOME graininess to WSF, even when polished, but it should be noticeably smoother than the unpolished version. Shapeways customers service is, in my experience, absolutely fantastic, so it might be worth dropping them a line. Let me know how it turns out!