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Fused deposition modelling is a 3D printing process that uses continuous filament of thermoplastic material filament in fed is the form of wire form a large spool. In stereolithography, liquid form of polymer material is present and UV falls upon the material. Due to UV, material hardened and forms a layer. Here, wire feed cannot be used. Also is selection laser sintering resin powder of polymer is hardened with a the help of laser.

In directed energy deposition process, feedstock material is in the form of wire or powder form is used.