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Sorry to hear your attempts to print this haven't been successful. The fact is not all machines print the same and some slicing apps have problems with the detail in the inner surfaces. Filament also can be the cause of this as well... Lots of people have successfully printed these as I'm sure you've seen and I've lost count of the number I've printed for people on my MakerBots. I assume you followed the instructions provided in which case it has to be due to one or more of the above. I wish I could help further but I know they work for most people and their machines /apps