Anyone found a way round being able to print out from more than two trays.

We have a project that's printed on to a 3 part NCR set and is numbered, so, we'd like to be able to print it collated. i.e. top copy tray 1, middle copy tray 2, bottom copy tray 3. Hey presto....we don't then have to hand collate the 3 parts together.

Any bright spark got an idea ?