The Universal paper size is a user-defined setting that lets you print on paper sizes that are not preset in the printer menus.
Notes:
From the printer control panel, navigate to:
 > Settings >
 > Settings >  > Paper Menu >
 > Paper Menu >  > Universal Setup >
 > Universal Setup >  > Units of Measure >
 > Units of Measure >  >  select a unit of measure >
 >  select a unit of measure > 
Select Portrait Width or Portrait Height, and then press  .
.
Press the left or right arrow button to change the setting, and then press  .
.