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.
Which cooling duct are you having the problem with?? I can't help if I don't know which part you have an issue with. All the parts have been printed hundreds of times and tested with many iterations of Ender 3s with no issues. That is not to say you don't have an issue. Please also take a couple of pictures to show me what is happening.