Ok, I am posting my first design to Shapeways (attached) and Joris is telling me that I have inverted normals, however when I run Rhino's CheckMesh, it says: This is a good mesh. General information about this mesh: Mesh does not have any degenerate faces. Mesh does not have any zero length edges. Mesh does not have any non manifold edges. Mesh does not have any naked edges. Mesh does not have any duplicate faces. Mesh does not have any faces that could make it better if their directions were flipped. Mesh does not have any disjoint pieces. Mesh does not have any unused vertices. ID: 94d44d5b-53d0-48ad-99d3-a2abd859df74 (7) Layer name: Default Render Material: source = from layer index = -1 Attribute UserData: UserData ID: B0EE2168-8EC6-42ed-A962-26DEB8CC8F9A Plug-in: Rhino Render description: Rhino Renderable Object UserData saved in file: no copy count: 1 Geometry: Valid mesh. Closed polygon mesh: 3204 vertices, 1068 polygons with normals bounding box: (-4.9841,-5.37043,-2.53855) to (4.44205,4.49075,2.3198) How do I fix this if my software says there is nothing to fix???