I have been uploading various files and strangely some get accepted and many told to give more love to them, and I don't know what I'm doing wrong. These are shots of three models from Netfabb after doing an analysis. They are all non manifold and everything seems to be okay on the results, yet it's rejected. Does anyone know what the checkered areas with alternating shading means? Or has any helpful advice Thanks. I have tried to upload wall thickness varying from 1mm to 2.5 mm. I think that cylidrical products like some of mine need to be at least 2mm, while flat models can pass as 1mm.