stepper motor nema 34 laser is engraving the negative space

stepper motor nema 34 laser is engraving the negative space 

M42 command is an immediate command. This means that it will run before the move GCode commands finish. This is exactly what I was facing.

1. The laser driver requires a 5 volt TTL input control signal. The Marlin fan control Mcodes (M106 and M107) will be used to control the laser .Unfortunately, the Ramps fan output (D9) is a 12 volt signal so we can’t use it. We'll need a quick firmware edit to remap the fan output from pin D9 (12v) to pin 44(5v).

2. Make a backup copy of your Marlin firmware folder first. Open the pins_RAMPS_13.h file in your Marlin firmware folder with a text editor (Wordpad). Search for the line where the fan pin is assigned and change it from pin 9 to pin 44.

3. Save the changes and flash the revised firmware back onto your Mega board.

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