A remix of Mirkoengineer's ducted fan. I've changed the motor mount to accept a 2204, 2205, 2207 etc. size brushless motor which are standard kit for anyone working with race drones. With one of these motors it is quite powerful and on 4S it will cause the fan to disintegrate :)

I'm using this fan as a fume extractor for my workbench. It is a little loud with the motor I am using so I'm looking into some vacuum cleaner hose so I can mount the fan remotely and to also vent the fumes outside. Also included is an .stl for an angled mount if you prefer to use it as a personal fan, but with a brushless motor it might be a little overpowered and noisy for that ;)

You will of course need an ESC and some way of controlling it, such as a servo tester, radio receiver, or an arduino outputting a suitable PWM ('Servo' library).