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This traditional print method typically uses either a rotary bit or a high power laser.
The rotary (or Pantograph) technique requires only a high speed spindle and a simple desk top engraver.
The surface layer of the plastic or metal surface is removed and this exposes, typically, the contrasting color of the material core.
In some cases, the engraved letter can also be filled. Laser or raster engraving is much more precise and can mimic most fonts.
The laser burns or vaporizes the top layer away.
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