Brother 4000CN - Manual (Page 71)

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When printing on the back of specialty paper, make sure that you configure the
items below in the printer driver when giving the print command from the program.
Printer Driver Settings
(for printing the back side of specialty paper)
Windows settings
Tab Item Setting
Paper/Output Paper Tray MP Tray
Paper Type Thick Paper 1, Thick Paper 2 or Glossy Paper
Macintosh settings
Dialog Box Item Setting
Paper Settings Paper Type Thick Paper 1, Thick Paper 2 or Glossy Paper
Printer Settings Paper Tray MP Tray
✏ Note
With custom sizes, it is necessary to configure other items to suit the paper size.
Refer to the previous section or the printer driver Help for details about these
settings. For details about how to use Help, refer to 3.4 “Using Help”.