The Magneto

A PC cooling fan designed to fit onto Noctua A12X25 housing. It contains of two counter rotating fans. The top one is driven by a magnetic gearbox. To assemble you need a ball bearing (8x22x7mm) to mount the top fan onto the bottom one. Also 18 neodimium magnets. Place them around both fans in the holes. Neighboring magnets should have opposite poles facing along rotation axis. At last You need 9 M6 screws screwd into the holes in the middle part.