heyy guys, hope you are all doing great! I have just signed up with Shapeways and I have been designing a ring in mind to be able to 3D print. After completing my ring at 3ds Max, I exported it .STL and uploaded it to Shapeways. I received an email from Shapeways informing me a problem with printing saying: "If you have any questions about your product, please look at our relevant tutorials or videos. * http://www.shapeways.com/tutorials/fixing-non-manifold-model s * http://www.shapeways.com/video/fixing-non-manifold-meshes" I went back to my 3D file and applied a STL Check modifier. I started cleaning up my file and making sure it is water-tight. After doing a final STL check, 3ds max informed me of 'zero errors'. Again, I exported it .STL and uploaded it to Shapeyways and i received the exact failure message. At this point I really don't know what to do with my file. I even don't know what do adjust. Hope for some advices.