I have Laserweb4 running on a Ramps 1.4/Arduino 2560/Marlin and I am brand new

@The_Best_Stooge current versión:
define SPINDLE_PWM_BIT 5 // MEGA2560 Digital Pin 8

See cpu_map.h

@Roberbike I looked in there and they don’t use the normal nomenclature Marlin/Ramps does so all of those bits lost me. Btw, is coolant D10? I read Coolant is always on somewhere in this version and was wondering what was connected to D10 that caused my hotend to smoke (got well over 290c)?

@Roberbike I had not changed to Ramps in the config when I uploaded so I am looking at the generic defines and see #define X_LIMIT_BIT 4 // MEGA2560 Digital Pin 10 but that shouldn’t cause my heater on the hotend to activate as that sounds like a read bit for the endstop.

@The_Best_Stooge There is other firmware that works for me:

D9 to suply 12V to the laser driver and D6 for 5V TTL.

I do not know if it makes sense to use this firmware with a non-TTL driver, because D9 is always on.
In your case, using a full power driver, the rasterization would need some speed changes and very fast accelerations. I do not know if a 3D printer can do it to get an optimum result. I haven´t one to play with it.

@Roberbike Probably not since TTL is just on or off (5v). I use PWM 0-12v so for me TTL would be 0v and 12v instead of 12v always on and the TTL to turn it on or off.

@The_Best_Stooge I am sorry, I madre a mistake. I wanted to say pwm.

I got it all hooked up and with the proper config for my setup and it signs in (connects) but none of my motors move when jogging.

I have a 2.5W Blue…PWM does not work with my particular laser module. Never figured it out. That being said the seller did not advertise my module as being PWM capable - so I really can’t complain.

@The_Best_Stooge What version of Marlin were you using? I have a very old version of Marlin and it isn’t supported at all by LaserWeb4. Maybe I should upgrade to the latest Marlin. Do you recall which version of Marlin you used that worked with LaserWeb4?

@Daniel_Perez At the time it was 1.6 I believe. I have since moved on and dismantled the printer I was using and have a 50 watt CO2 laser now.