Does your printer currently have ink in it? If so, you could use the Quadtone RIP calibration feature, to purge the lines and fill them with Piezoflush (I believe that the Quadton RIP is still free, if only used as a cleaning utility). It may take 7 or 8 purge pages of photo paper, to fill all of the lines. However, cheap photo paper from Wal Mart (or similar) should work for this. The paper will be quite wet with ink, when it comes out. So, afterwards, run a couple sheets of plain paper through, using the roller-cleaning feature.