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Improved Printrbot Fan Duct

por 50an6xy06r6n

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**UPDATE 1/5/2015:** Version 7.2 uploaded with a version that (hopefully) fits the new metal hotend from Printrbot. Feedback on the fit is appreciated. The duct is also slightly wider for better airflow. The Solidworks file contains both configurations and now has better feature tree organization. I've also done some flow simulations for fun, and they seem to indicate that it works reasonably well. Not very experienced with flow simulations, but it makes for pretty screenshots.

**UPDATE 2:** Version 7.1 has been uploaded and is shorter to accommodate correctly installed hotends. Hopefully the centering works universally, but I have no way to verify that, so you'll need to let me know how it works for you. According to my measurements, this version extends no more than 2mm below the Printrbot-supplied fan shroud, so hopefully it will work for anyone who used that one successfully. Question: Is there a best practice for dealing with legacy files? I'm reluctant to remove them, but it s

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