does your laser use a 5v signal? Sounds like it does. do you know what size your beam is? and what is your interval set at on the cut info section of light burn. Until you get the fill working on a vector, I’m thinking doing any raster engraving will be difficult at best.
it is a 5v signal… line interval is set to .1 and the size of my beam is 450nm
I tried keeping it simple. i have the settings to mm/sec should i change it to mm/min?
450nm is the light wave of your laser. I meant the diameter of the “burn” spot? Our machines work on mm/min so that will help a bit with quantifying your feed rate with out doing a conversion. It still sounds like your laser is firing like a TTL control as opposed to PWM. does your laser support both modes? .1 is what I am running with a very tight beam spot so that should work.
I dont believe it supports ttl - how would i check?
not sure of the diameter of the burn spot. im going to assume I have it in focus like a youtuber who has the same laser and say 0.0635mm
Which laser module are you using? I apologize if you said that earlier in the thread…
the Oxlaser 5.5w 450nm diode laser.
The online page says TTL control switch, PWM control power. And it has a 3 wire connector (+12V, GND, PWM). So I’m guessing it takes PWM on that plug. Not sure what that TTL control switch blurb is, unless it’s talking about the on/off switch being a TTL control to the laser? Which would be silly, if it’s being sold as a gestalt. 
TTL just means it is 5V logic, and it’s often misused. The PWM might work with a 5V PWM signal.
So I am guessing that you are using it in the 3 wire configuration as opposed to the optional 4 wire. do you have access to an oscilloscope so you could measure the frequency and voltage on the PWM line? it looks like it wants a <15khz pwm signal (0-5v). I am not sure what is coming from the RAMBo board, but I’ll bet someone on here does. One more question, are you running one of Ryan’s Marlin firmware builds? Only reason I ask is I am using the M106 and M107 commands to control my laser, but it is also a 12v pwn and I’m using the P1 Fan pins.
my laser uses 5v PWM on a 3 wire system
this is from the documentation on the laser:
- Size: 40*70MM(IMPORTANT: this is bigger size than 2.5W and 3.5W , please check if your machine can hold a 40mm laser!!!)
- 2.5W 3.5W and 5.5W ARE ALL FOCUSABLE
- if you want use it to connect 110–240V power source directly , please get yourself a 12V 5A DC Adapter, and need to cut the wires and connect wires red to red, black to black
- please pay attention when connecting wires : RED wire=12V+ , BLACK wire=GND -, Yellow Wire= PWM!!! wrong connection of the wires may damage the driver board and the diode
- PWM: 0-5V, frequency: <15K，This laser needs 12V 5A power supply adapter!
Just read your setup post. Still would be good to see what you are getting on the signal line. Have you tried sending gcode from the console tab of lightburn? Like M3 S8 (wouild be like 3%) then change to M3 S255 and see if you can see a diffrence in laser intensity? make sure your light burn is set to 255 steps, it defaults to 1000 and that will cause problems also.
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Here is the result of S8 (move to the right) S255 And S-Value Max is set to 255 in the device settings
I tried to do a M05 as quick as i could (coppied and pasted it as soon as i did the above M03)
Like i said the laser seems to be working fine during most other operations, just not fill or raster…its like it forgets to move back and forth. I just tried moving the x and y axis at different speeds and it worked fine. 1000mm/min, 1400mm/min, 6000mm/min – no issues
Unfortunately I dont have an o-scope; its on the bucket list though -
Is there anything in the firmware that may cause an issue - the only thing I can think of is i have the dual endstop version loaded but have yet to add the switches (I have it set to Normally Open)
That is really interesting.