Congratualtions, we now have a printable mesh. However, it doesn't look that good. Unless you are cosplaying as a low polygon video game character, you are going to want to smooth things out.
To smooth things out we are going to use Blender's Subdivision Surface Modifier. Open to the Modifiers tab and then go to Add Modifier > Subdivision Surface.
Add Modifier > Subdivision Surface
The setting you want to play with now is the number of subdivisions (View, not Render). I generally like to do 3 or 4. The more subdivisions, the smoother the surface. However it will also make more polygons which means larger file sizes and slower performance.
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