Abstract: Continuous jetting of liquid metal droplets for deposit on a substrate includes an ejector, a deflection device, a print chute, and a collection reservoir. Liquid metal from a cartridge in the ejector provides a continuous molten material stream through an orifice-defining structure while a vibration device creates a standing wave in the stream to break the molten material stream into individual droplets which receive charge from a charging device. The deflection device enables the positioning of the charged droplets to be controlled for placement on a substrate. Control systems assist in the calibration and control of the continuous stream to ensure that selected droplets are placed at desired locations on the substrate.