I have a Roland SP300v..... My prints have been getting messed up from the head hitting the material. It doesn't jam or anyhting, so I usually don't see it until the job is completely finished. I can understand the edges curling up sometimes causing this problem, but how is it hitting the center of the vinyl? Today, I noticed that I had a spot in the media that was slightly raised and seen that it was going to be a problem. I reset the media, made sure it was tight, pre - unrolled the media, etc.... and still could not get the media to lay completely flat. Do you guys have any tricks or tips for this? Thanks