Sanding, bead blasting, and vapor smoothing are the most-popular methods for achieving smooth plastic 3D-printed parts.
There’s a misconception that 3D printing cannot make the kind of smooth and polished parts available from traditional manufacturing technologies. But finishing techniques can address such concerns, and they are widely available. For example, RedEye, one of the world’s largest providers of 3D-printing services, offers finishing services for parts printed from fused-deposition modeling (FDM) and PolyJet machines.
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