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.
Your contributions are licensed under the open source Creative Commons license.
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