All Metal Hotend fan duct
thingiverse
I'm upgrading my Micro Swiss all metal hotend by ordering this fan duct from Aliexpress. You can find the exact one I've purchased here: https://bit.ly/2Ocrq49. This versatile duct is designed to fit multiple setups, but I'll be pairing it with a custom blower setup found on Thingiverse at this link: https://www.thingiverse.com/thing:2767047.
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