The cleaner your files are when you send them to be produced, the less chance there will be of a print error. Use these guidelines to prepare your design files for print.
PULL THE BLEEDS
Give each edge that has a bleed at least .125"
REMOVE ALL UNUSED SWATCHES FOR THE FILE
If you convert spot colors to CMYK, you still need to remove the swatches from the color palette or they may show up at the printer as additional color separations.
RUN SPELL CHECK
Even if the file has been approved by 100 people. Let the project manager know if you found an error and correct it.
SEARCH FOR HIDDEN ELEMENTS
In the design process, some elements may have been hidden, but forgotten and left in the final design. Show all is a great way to find those hidden elements and delete them.
CONVERT LINKED/EMBEDDED IMAGES
If printing CMYK, convert the images to CMYK.