How it works
If you were to look at the surface of an MJF printed part with a microscope, you would see that the surface is made out of millions of partially fused polymer balls, about 60 microns in diameter. These polymer balls form microscopic mountains and valleys which make the surface appear rough. When parts are vapor smoothed, they are hung in a special machine that surrounds the part in a cloud of solvent which causes the micromountains to dissolve and fill in the microvalleys. Once dry, this new surface is smooth and glossy.