Found that part of the engraving object surface was not engraved.

  1. It is possible that the thickness of the material itself is uneven, and the engraving starting point is set at the thickest part of the material. This may happen that part of the material surface is not engraved. Therefore, the starting point should be set at the thinnest point of the engraving material. 
  2. It is possible that the tool bit breaks during the engraving
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