CR-10 40mm Stock Hot End Cooling Duct - Sturdy

Edit 2018-01-16: Upon request I uploaded an f3d file (fusion 360) for remixes. Please excuse the messy file, I am by no means an expert in Fusion 360.
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This is a remix of the [superpotatofudges 40mm Stock Hot End Cooling Duct](https://www.thingiverse.com/thing:2160958). On my CR-10 using [jneilliiis Radial Fan Fang](https://www.thingiverse.com/thing:2237084) the cooling duct and with it the hotend became loose after a couple of prints in my enclosure. I suppose it was the hea