Issue Where does the Speed Controller fit? #2

As per the title, i have printed this fan and i am at the stage of building it, however i can not for the life of me see where the speed controller board should go. You have shown where the potentiometer fits however not the control board. Also no mention of recommended power or how to deliver it to the speed controller. Not a great issue but would be useful to know what you did....
However great design and i am looking forward to trying it out once i have finalised these little bits...