Random rays and lines show up in pdf printed from autocad. Piston with dimensions 3d cad model library grabcad. The grabcad library offers millions of free cad designs, cad files, and 3d models. Join the grabcad community today to gain access and download. When printing to a physical printer, an autocad pdf generates random lines with distinct coloration over hatch objects. Autocad 2017 added the capability of editing pdf files. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Computer aided drafting autodesk is the most popular drawing program many student versions available for free online at students. In this video i will make a representation 3d drawing of piston. Is there a setting that i may have uncheckedchecked that needs to be offon. In this video to will learn to draw drawing of piston and its 3d model. Editing pdf and other drawing file formats in autocad. Final project design a fourcylinder internal combustion engine project and engineering department. I have problems with my line weights on plotting pdf.