Fused Deposition modeling uses thermoplastic filament, which is heated to its melting point and then extruded, layer by layer, to create a three-dimensional object. FDM follows a defined automated process. It builds parts layer-by-layer from bottom up by heating and extruding thermoplastic filament inside the hot end, through the nozzle as a liquid onto the print bed where it immediately hardens and fuses to the layers below. The repetition of this process forms a 3D object layer by layer. FDM is particularly popular among manufacturers who need the flexibility to use engineering-grade thermoplastics
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