I wanted to make a fan housing that would run off a USB cable.  This is the first version and I want to start slimming down its profile and making it more visually appealing.  I used a 5V motor (1.5 inch OD) and a lit rocker switch .  Machine screws hold the pieces together while the motor is press-fit into the motor mount.  I printed this on my Craftbot with PLA and medium quality settings.  There is very minimal to no support for most parts.