It is intended to provide a powder supply device for a 3D printer. In the powder supply device of the 3D printer according to an embodiment of the present invention, a receiving space for containing powder is formed, and a discharge port through which the powder is discharged is formed and moved in a horizontal direction, but powders having different particle diameters are respectively accommodated. It includes a plurality of recoaters and a stage which is disposed below the recoater so as to be spaced apart from the recoater and receives powder supplied through the discharge port.
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