Finnish electrical engineer and master machinist Miko Syrjälä has released a USB hub device for print through Thingiverse. This four connection creation uses the cigarette lighter charger to provide the current to operate any four USB devices. Having found himself with a limited number of connections and a fascination with 3D printing, it didn't take long for Syrjälä to develop the idea, model it, and print it for use. Check out his design here: http://3dprint.com/92826/3d-printed-usb-hub/