Can I print on checks that are 3-inches in length?

• Yes. You'll need to set up the paper size in your software. In Windows you'll need to define a custom paper size. If you're using software that does not have an option to set a paper size, try setting the page size on the printer. See Changing the Default Settings in the LX-300+II Reference Guide.
  
  Note: Software settings always override the printer's default settings.