To help us ensure your print job is successfully output it is vital that the original digital artwork is created correctly. To achieve this we recommend customers supply files as PDFs or jpegs with following rules.
File is 1 up or single pages
All colours are CMYK
All fonts are embedded or converted to curves
All images are at least 300dpi
Layers are flatted
3mm bleed is added to all edges
Safe area is 5mm
Crop marks are added
Creating a PDF
Save or export using PDF/X-1a setting.