I have tried uploading my theatre model to be printed. I originally sent a earlier version of this model which uploaded fine - however it was rejected as some of the spirals were too thin to be printed. I went back into the model to thicken up some of the spirals and re-uploaded it. However it then came back saying it would not print because it was not manifold.
I checked the model in netfabb, repaired it, put the model back into rhino and checked all the meshes there too. They all seem perfect - no holes, no degenerate faces, no naked edges, no duplicates, no non-maniofold edges, all normals facing the same direction - so according to all my programs there is nothing wrong.
Could anybody please help? I have included my 3D model, if anyone is able to take a look for me it would be massively appreciated.