I created several pdfs from Civil 3D. The PDF size ranges is from 200KB to 1.9 MB. When I send the PDFs to the printer, they grew 200-300 times their original size. This doesn't make sense especially when it bogs down our printer. I even shut off the function in Civil 3D for including layer information and still when I plot Reader flattens my PDF. How can it flatten something that doesn't need to be flattened? Any answer would be much appreciated.