Posted by dellus on Feb 22, 2020; 11:54am
URL: https://forum.librecad.org/resolu-illegible-print-tp5718434p5718442.html

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A standard line width for a normal line is 0.25 mm. Lines showing cut massive objects like walls maybe 0.5 mm. Or alternatively give them a fill color.
You can define the line width as a property of the layer, but you also can assign it individually as pen property other than "By Layer", while drawing or afterwards with the "Properties" (single entity) or "Attributes" (several entities possible) command.