According to the specifications, this printer supports media as follows:
- 100-sheet multipurpose tray with straight-through paper path for heavier stock and custom-size media from 3 x 5 inches up to 12.28 x 18.5 inches
- 250-sheet input paper tray that handles media sizes from 5.8 x 8.3 inches to 11.7 x 17 inches
which implies that 12 x 18 paper size can only be achieved through use of a custom-defined size in the multipurpose tray.