Currently I'm using Marlin 1.1.0 - RC6 for a printer that I have attached a Laser to.
I have been using M106, M107 and D9 (connection) for laser on, off and power control.
I see that in Marlin 1.1.8 M3, M4 and M5 have been set up for spindle / Laser control.
Is there any advantage of M3, M4, M5 over using M106/107? I know that I would need to
switch to a 5V PWM pin but is there anything else?