When we print most products on press, we print them at a slightly larger size than the trimmed, final piece we give. We are basically printing the pieces at bleed size. We then use electronic cutting machines that have guillotine blades to slice through the stack of sheets and cut all pieces down to the final size. As the blade slices through thick stacks of press sheets, it can shift. This is why we require files to be provided at “bleed” size, which is 0.125” bleed on each side.