Large paper sizes are commonly needed when CAD (computer aided design) software is being used. This type of software is often used by engineers and architects when making large scale drawings. Some applications require that you create custom forms, or paper sizes, in order to print to a particular paper size.
There are two ways to have Raster Image Printer use a larger paper size:
A good example of a situation where users would need to configure Raster Image Printer to use a custom paper size is if they are printing oil well logs and therefore need to print a long page as one continuous page.