When you have this problem you need to determine if the ribbon is wrinkling before or after the head. If it is before the head then you need to adjust the bar prior to the head. There should be a phillips head screw there and directly behind it there is an adjustment. Loosen the screw and then move the bar (it is slightly arc'd) so it smooths out the ribbon. This is the least likely suspect. Most likely the head is not square. If the head is not square with the roller below it will cause the ribbon to "dance" as I call it. It will slowly move over then jump back to its rightful position. Or it could just wrinkle. If this is the case and your print looks good then you can adjust the ribbon bar right where the ribbon comes out of the head. There are two screws at the top. Loosen both of them and this adjustment bar will slide all the way back. Once this goes back. Manually manupulate it until it smooths out the ribbon. Once you manually figure out where it is smooth then tighten the screws back up. Feed a few labels and see if the ribbon is smooth.