Pencil layout marks are preserved when boards are cut
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Pencil marks stay on the piece no matter how you work it
Pencil and chalk marks in Sawdust now follow the material through a cut. Each resulting piece retains its portion of the mark, clipped to the new edges.
You can use the marks to explain a cutting sequence without redrawing the layout after every operation. Inspect the resulting pieces to check which lines remain on each face.

For instructions, see How to inspect a woodworking part from useful views.