When I print a map from QGis Composer to any one of my 4 printers the resulting map does not scale correctly. If I print a map which is 1 inch = 100 feet and my scale bar is set to 100 units the resulting bar scale does not measure correctly. My scale bar is set for 5 segments and should therefore scale 5 inches but it is not. It is measuring 4.85 inches. If I print to PDF then print the PDF to any printer then it prints correctly.