Im trying to find this information on the site, on the materials gidelines and on the tutorials but I cant find it. I have this model, http://www.shapeways.com/model/1143420/rikipeke02b.html very big and flat. It is inside the Bounding Box Limits. But for some reason, the moment I increase its height a little, the prize suddenly goes up extremely fast. For example http://www.shapeways.com/model/1143416/rikipeke02.html Both models are the same, the only difference is one little stick and suddenly the price is over 70â‚¬ more. Why does this happen? Is there a Bounding Box Limit that increases the price?