Linetypes play an integral role in visually separating certain elements of our designs. Most of the time one of the 40+ linetypes that come with AutoCAD will suffice, but there’s always that perpetual need for one more linetype. While its true linetypes must be developed, the good news is that it’s not as difficult as it sounds.
In their most basic form, an AutoCAD linetype is really nothing more than a .txt file with a .lin extension. It’s completely possible to create linetypes using nothing more than your bare hands and Notepad (the digital variety that comes with MS Windows). For those who prefer a more graphical approach, check out the Make Linetype (MKLTYPE) tool found on the Express Tools Ribbon tab > expanded Tools panel. If you know how to draw and trim lines in AutoCAD you can also create custom linetypes.