The outcome of the engravings using smart fill batching processing seems to be inconsistent. Some may be darker and some lighter.

This is usually due to the inconsistent texture of the materials. Please try with a batch of material that comes from the same source to avoid quality differences across the materials.
This is usually due to laser spot being coarse away from the center of the processing area and the nature of some materials. Metals that are usually hard to engrave such as copper, aluminum, etc, and the ones that are sensitive to laser such as stainless steel, are prone to this issue.

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