Hello Shapeways, Recently, two of my models have been rejected due to wall thickness issues. Below are the screenshots received by Shapeways showing this issue: Steiner model Trefoil model I did a measuring myself to another model of mine, which has been successfully printed by shapeways and now I have it here, in my house. I am talking about my Holes model, located in the following shapeways url: http://www.shapeways.com/model/68363/holes.html Bellow you can see my measuring: I realized that the above model has exactly the same problems with my rejected models (the ones in question), however, it has been successfully printed by Shapeways and it looks great! Really great! Bellow is a screenshot of the printed model (sorry about the bad photo): I also noticed, that Shapeways is using netfabb for measuring. netfabb only uses mm as a measuring unit. Bellow you can see the same model measured in netfabb and maya: netfabb measure maya measure. As you can see at the last 2 screenshots, numbers are almost the same. The only difference is that maya units are set to cm. That means, that a distance of "0,34mm" in netfabb, is actually 0,34cm in real, since maya measures in cm and the model has been totally designed in maya. However, some of my models are already rejected due to this kind of measuring. Any help on this will be welcome.