problem thick lines in print

[flynight]

Good evening to all, I am a university student and I am using autocad to realize a project for an exam.
My problem is very simple and I think it is equally banal to solve!
when I print in pdf and in a4 format the lines are very thick and overlap, although I have used thin lines on the work area.
probably there will be something to set up, but I don't know what.discussed, but I'm at first.I hope I've managed to explain the problem, thank you in advance.

 

[Dario1982]

Hello and welcome! the lines that are thick in print, what color are they? and in the ctb that utlizzi, what thickness is set for that color?

 

[MassiVonWeizen]

What's the color?
rather it is necessary to know if and how the various layers are set, if the thickness of the lines is from layer or is forced and if a specific ctb is used (in which case the color determines the thickness but it is not that knowing whether it is yellow or red define something)