How retract height is calculated from maximum safe Z

Learn how the retract height written in the nesting file is derived from the maximum safe Z value and the board thickness.

1. With the top plane selected as Z origin reference, the retract height written in the nesting file equals the maximum safe Z value minus the board thickness.

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2. For example, a maximum safe Z of 68 on an 18 mm board produces a retract height of Z50 in the file.

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