... of the printer is 841mm (A0) so I printed my pages created a PDF with a page size of 841 x 5000. When I took the file to the printer the PDF page size was 850 x 5011. Obviously I can create a slightly smaller page width to fit the printer, but what occurred here? Hi John, You can choose whether the entered dimensions apply to the full PDF page, or the finished page size after trimming it to the red margin lines. Tick or untick the box as required: 2_091842_150000000.png With the box ticked, you need to set a page size smaller than the printable area. I suggested allowing 20mm for the trim margins in my previous reply. Generally, if you will be trimming and fitting multiple pages to the red margin lines, it is better to tick the box and set a convenient size between the trim margins, usually matched to the grid lines. If you are printing a large single page, the red trim margins won't be used, so you can untick the box and set almost the ...