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We should be able to turn off printing of the red line showing the Right Margin, when printing with "Print as in editor" option turned on! The "Print as in editor" is the only way to print in colors, but the red line does not help to make a nice printout.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss