This is a 40mm fan mount working as a funnel for the 30x30mm body of both chimera and cyclops extruders. It's attached to the extruder by the top. I'm using it in a delta printer using this effector: http://www.thingiverse.com/thing:1072638 so I also printed a washer of 5mm of height for the third bolt to keep the extruder leveled. I've designed this mount because I thought that a 30mm fan wasn't enough for two hotends. Hope you find it useful!