This article will give you detailed instructions about the operations, required to do quick and accurate full sized layout printouts in SCARM. [>>>] Print Whole Layout in 1:1 Scale (Updated)
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This article will give you detailed instructions about the operations, required to do quick and accurate full sized layout printouts in SCARM. [>>>] 
Read this article to see how SCARM draws the tracks in 2D and 3D modes and to prevent misalignment or confusion when laying tracks over full-size printouts.