Posted by dellus on Jul 01, 2017; 10:04am
URL: https://forum.librecad.org/Drawing-Line-width-different-than-printed-width-tp5714995p5715021.html

If your circles look like donuts in drawing mode, they are very small in comparison to the line width, for instance 2mm diameter at a line width of 0.5mm.
In drawing mode line width always looks like when printed at scale 1:1.
In print preview with a scale set at 1:1 it will look like in drawing mode, but with scale set at 1:10 or 1:100 lines will look fatter in relation to the drawing contents, as lines will be printed in their fixed width, whereas the geometry will be scaled down. If you want the lines thinner you would have to set a scale of maybe 10:1, upscaling, which is unusual.
The problem seems to be lying in the initial drawing layout. If you are drawing an electrical diagram there isn't really a scale to apply, so probably you will use 1:1. Or if you want to draw the electrical installations of a house into a floor plan you might need 1:100. What is it you want to draw?
You may have to change the size factor when importing elements from your library.
I recommend to draw a rectangle in the size of the intended print paper first (adapted to intended print scale), to get a feeling of sizes of your elements on the sheet when drawing. I have included 2 templates in 1:1 and 1:100 you can try out.

No, there is no drag and drop from the library to the drawing, you have to click on the symbol, and then on "Insert", below. The tab above the drawing screen will change and offer fields to set angle and factor at insertion, choose insertion point and insert.

mech_mm_1_1_a4.dxf

arch_cm_100_a4.dxf