An embodiment of the present invention provides a nozzle device for an FDM-type 3D printer, comprising: a filament supply unit to which filaments for FDM are supplied; a filament nozzle which is positioned under the filament supply unit and melts the filaments supplied from the filament supply unit to output molten filaments; a heater block which is provided around the filament nozzle to melt the filaments inside the filament nozzle; a gas tank; an aerosol generation unit which generates a nanoparticle aerosol; a plasma generation unit which generates plasma; and a plasma nozzle through which the plasma is ejected to the molten filaments, wherein the nanoparticle aerosol generated in the aerosol generation unit flows, together with the gas in the gas tank, to the plasma generation unit through a transfer pipe, and the molten filaments are surface-treated by using the plasma generated in the plasma generation unit and nanoparticles.
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