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These are lenses, mirrors, and sensors used by the printer to determine how it is printing. Any damage will affect the quality of printing.

Using a clean cotton swab or lens brush, GENTLY clean the visible sides of every clear or reflective surface you can find.

Do not scratch or rub the optics, use a brushing motion instead.

For more details on what you are doing and why, refer to the document mentioned in the introduction.

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