Not quite. If you have a Jtech Photonics driver then you can wire both the extruder fan/s and the laser driver to D9 because the Jtech driver can handle the 12V PWM Fan output. If you’re using a generic laser driver then it will most likely take a 5V PWM control signal. The firmware edits that I linked in the last post will send the control signals to D9(12V PWM) and also to pin 44 (5V PWM). Your laser driver should be connected to pin 44(5V PWM), not D9(unless it’s a Jtech driver).