60mm to 90mm Fan Converter

thingiverse

I've created a custom adapter that enables the use of a 90mm fan from an old PC as a part cooling fan on a standard 60mm cooling duct. To connect this setup, you'll need four self-tapping fan screws or alternatively, eight washers and four bolts to secure the 60mm section of the adapter to the 60mm connection point on your device. Alternatively, four cable ties can also be used for a secure attachment.