Hi, I'm posting here because the feedback.shapeways.com site does not work for me. My idea is to let the creator of an object to say what is its minimum wall height and/or minimum wire size and/or minimum embossed details. Then the ShapeWays website can inform more directly the creator about the materials that don't fit the object. That could also be a feature for the ShapeWays API : if someone is creating an object on a website that uses the API, the user could be informed which materials are adequate and thoses which aren't. Theses fields can be private or even public so that people buying the item know more about the product's properties (this is not revealing the volume). I have to precise SW does not have to compute anything - the fields are up to the creator and are optional.