Above is an example of the tracks across a printed image. Most people using Epson products use them for personal or business applications that require accurate color, but longevity is not an issue.
Most people care more about color than the paper it is printed on.
The OEM Epson papers provide Excellent color fidelity but begin to fade rapidly due to the high acidity of the paper. Many People wish to use paper other than the standard Epson paper for better longevity. Some archival papers function in the Epson printers without problem, but some of the thicker, textured paper used for fine art printing do not. Unfortunately the wheels that are fixed are not designed to allow for thicker paper than the Epson OEM paper. Some go away after a week or so, but if the ink was still wet enough, the wheels will track it on the paper, and light areas of your prints will have lines of dots across them every few inches.