When exporting the project as DWG, a file with the CTB extension is created containing the pen thicknesses. This file contains information about the pen thicknesses you used in the project. Before you take a printout, you need to introduce this file in the plot dialog in the CAD environment. Thus, the color and pen thicknesses we use in the project are applied without any change in the printout. There is a detailed explanation in the link. Take it easy, Good work..
German 
French 
Spanish 
Portuguese 
Italian 
Arabic 
Russian 
Japanese 
Turkish 