60mm to 90mm Fan Converter
thingiverse
Made a converter to use a 90mm fan from an old pc as a part cooling fan on a 60mm cooling duct. Requires 4 self tapping fan screws or 4 screws,8 washers and 4 bolts (since holes on fans and converter are 4mm holes) or 4 cable ties to connect the 60mm section of the converter to the 60mm connection on whatever you're connecting it to.
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