It is important that artwork is positioned centrally on the layout. Our pre-press system works from the centre of the page in aligning jobs for print.
At pre-press the correct size aperture for the job to be printed is filled with the image on the page running out from the page centre. If a job is off centred then potentially only a portion of the job will appear in the aperture and be printed! (fig.1)
It is also important that jobs back up correctly with the orientation of each page being the same. We strongly recommend printing proofs from the PDF you have created to your own printer prior to submission. (fig.2)
If the sheet holding the reverse image must be rotated to back up correctly with the front then the file should be altered! Making a physical mock up will highlight potential errors which are not easy to see on screen. (fig.3)