Troubleshoot marks on the pages printed out by a Dell 1720dn (or just 1720) printer 3.75 inches (9.52 centimeters) or just under 4 inches.
Three and three-quarter inches. Just under four inches.
3 3/4 3-3/4 3 3/4" 3.75" 4"
This is the imaging drum. marks spaced at these intervals are equal to the circumference of the imaging drum, and indicate a problem with the imaging drum.
imaging drum circumference 3.75 inches (9.52 centimeters).
Spacing of marks
Printout page laser printer dell 1720
Couldn't find this on the SEs