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Are those printed fan blades inside the fan box? I guess they must be, as how else would the motor push air through the box, but from the look of the images they seem connected to the housing and wouldn't spin freely. Maybe I'd better just download and try it out. Are you finding that this printed fan with motor works as a reasonable replacement for a commercially-bought PC case fan? 

I guess the motor would run just fine from any 5V line on the Printrbot's PC power supply?

Is anyone using this fanbox?