A tiled poster that fits a home printer.
The US Letter preset builds each PDF page at exactly 8.5 by 11 inches. A safe outer margin accounts for the area that many home printers cannot reach.
Neighboring pages repeat a narrow strip of the image. The repeated area gives you something to align before taping the sheets together from behind.
If the final dimensions matter, use the exact-size mode and run the printer scaling test once. Most size errors come from a print dialog set to Fit rather than Actual size.
