Brother MFC-J4310DW Software User's Manual page 32

Printing
Advanced 2-sided Settings
Some types of print media may need more drying time when using the 2-sided feature. Change
Advanced 2-sided Settings if you have problems with smudged 2-sided prints or paper jams.
Normal

Choose Normal to print at a typical speed, using a normal amount of ink.
 2-sided 1 (Slower print speed)
Choose 2-sided 1 to print at a slower speed, using a normal amount of ink.
 2-sided 2 (Slower print speed & less ink)
Choose 2-sided 2 to print the same speed as using 2-sided 1, but using less ink.
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