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CR-200B Marlin Led control

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I own a CR-200B enclosed printer . after solving the "filament eating problem" by adjusing the stepper motor currrent, the printer works great.

I like to edit the Start-G-code  and the end G-code  in Cura to turn on the Led by starting a print , and turn off againt when printing has finished.

I tried to edit the start code with

M42 P6 S255 ; led on    and     M42 P6 S0 ; led off  but nothing happens .

Can someone help me out with this please?