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In a printer, accurate spacing between the pen and the paper is critical. If it is too high, then the

drops will not land on the paper in the correct location. If it is too low, then the paper will contact

the pen and cause damage or smear. In certain applications, such as an over printer, many different

media types can be printed on the same system and these media types will have different thickness

and therefore the pen to paper spacing will need to be adjusted. Also, there is variation in media

thickness and pen height that is difficult to account for.

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