NEMA 17 (42mm x 47mm) stepper motor cooler. Suits 40mm x 40mm x 10mm fan.

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Both Left And Right Exhaust To Avoid Blowing Onto Printer Bed. Would Advise Printing In Abs With At Least 70% Infill To Avoid Warping. Fans Are A Tight Fit To Avoid Having To Use Screws. If The Fan Clicks While Running, It'S Too Tight. Just Sand The Side A Little.... *Update 1* Added Version With Cable Tidy And Zip-Tie Holes. *Update 2* Added A "Twin Fan" Version To Help Cool Head.I Found Once Inclosed, While Printing Abs The Head/Hot End Inlet Gets Too Hot. This Caused The Abs Layers To Remain Too Soft And Jams Due To Material Getting Hot Too Quickly In The Nozzle.

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