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I suggest redownloading the STL file, or more likely double check that you're printing it at the original 100% scale. All of the cooling ducts have been printed and tested to fit the Hero Me Gen2 base AND the 5015 fans. There are some rare 5015 fans that are wider (15.8mm) than the specification for a 5015 fan. I have created the ducts to work with fans that are manufactured to spec (15mm wide).