Greetings PFers, Would it be possible to move microscopic particles of a wide range of composition (conductivity, density, etc...) using a directed beam technology? The idea is to have a fast 3D printing technology (practically no moving parts) that is capable of depositing of a wide array of materials at high resolution. I'm thinking of a configuration resembling a cathode ray tube with the particles fired downwards, impacting the part's current layer. There would be some sort of screen or membrane where the substance is dislodged by the beam and is carried to the part where it impacts and is fused. My primary concern is how the substance would be "carried" with the electron beam to the target location on the part. Perhaps a combination of using electrostatic attraction and the electron's momentum to transport the substance to the target. Perhaps using a directed alpha radiation or electron beam? Your thoughts would be appreciated.