An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a charge retentive surface is developed with toner particles to form a visible image thereof, including: a toner dispenser; a donor member for transporting toner from the housing to a development zone; and a cyclone separator system, connected to the toner dispenser, for separating the toner and supplying toner particles of a predefined size into the housing.