MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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See screen shot for how the 5015 fan is mounted. If this is not the issue you are having, please describe otherwise, include a photo of where the issue is, and what specific STL part you are having the problem with.