Laser is cutting thru pieces and dead areas

I am trying to cut some Glasses out of some bass wood and the laser initiates at the Corner End of the Frame and cuts through the finish product, also most all the way through. How do we get that to stop? 2nd - Can I add a g-code funtion to turn-off the laser after it homes when completed? Right now its until I change COMs or flip the switch. What I have done to try and fix the 1st issue is below, after my console info. I have gone through a ton of different LB forum Posts, GRBL github posts linked by Ox or JohnJohn but everything I have attempted has not worked.

Posts I am referring too:

Creality 5W Falcon Laser Not Discoverable with Mac OS, Firmware Update Issues, & More → for firmware issues
Newbie here with lots of questions - #9 by JVL

Referring to the picture below, the Red Line is what is cutting through the Frames.

Now my equipment is as follows:
I bought Lightburn last night and installed 1.4.01 on Windows10 22h2
Creality Falcon controller with a 10w laser on a Ender 3v2 chaise(220x220).
I am currently using a USB 3.0 10’ extension cable to the USB A-USB C cable until my 12’ USB A to USB C comes in from Amazon this weekend. I might be adding a camera sooner than later as well.

I have the g-code for the frames at the very end of this post!

My console notes from the second I connect it to “$$”

Waiting for connection…

e[0;32mI (1963) usbtiny: USB initialization DONEe[0m

1| Pulldown: 0| Intr:0 e[0m

e[0;32mI (2519) gpio: GPIO[14]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 e[0m

e[0;32mI (2520) xmc400x: clock: 100000e[0m

xmc4004 init is ok

Grbl 1.3a [‘$’ for help]

beep run

beep run

e[0;32mI (1149408) usbtiny: Line state changed! dtr:0, rst:0e[0m

e[0;32mI (1150443) usbtiny: Line state changed! dtr:0, rst:1e[0m




[MSG:Using machine:ESP32S2_V1]



b dir:3 head:0

tarx=-242.000000 tary=-242.000000 xmm=-19360 ymm=-19360 xstep=-19360 ystep=-19360

b dir:0 head:0

tarx=10.000000 tary=10.000000 xmm=800 ymm=800 xstep=800 ystep=800

cycle stop

b dir:3 head:0

tarx=-242.000000 tary=-242.000000 xmm=-19360 ymm=-19360 xstep=-19360 ystep=-19360

[MSG:X Axis limit switch on pin GPIO(40)]

[MSG:Y Axis limit switch on pin GPIO(42)]

stop st_go_idleHOMING_CYCLE_ALL:3













































What I have done to this point:
I upgraded the firmware on it(that fixed the laser being on at 100% full time from the second it got power until it went into standby mode) and had to do the $3=3 to reverse the polarity due to the firmware. I did the $32=1, Changed both the $30=1000 to $30=255 and did this in the Device Setting at S-value max

This last Attempt I did, I even broke the frames into 3 layers thinking the transition of each layer would be a trigger for stop and start, but that didn’t work.

Any help mainly with the laser burning the finish product is my #1 concern then the laser homing and staying on is secondary!!

Thanks for any and all help!

Here is my g-code
; LightBurn 1.4.01
; GRBL device profile, absolute coords
; Bounds: X40.54 Y23.22 to X115.46 Y44.78
G00 G17 G40 G21 G54
; Cut @ 350 mm/min, 90% power
G0 X47.497Y26.532
; Layer C01
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G1 X47.008Y26.985
G1 X46.811Y27.218
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G0 Y27.39
G1 X46.665Y27.421
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G1 X48.769Y25.841
G1 X48.36Y26.015
G1 X48.057Y26.164
G1 X47.769Y26.337
G1 X47.497Y26.532
; Cut @ 400 mm/min, 90% power
G0 X84.187Y31.138
; Layer C02
G1 X84.003Y31.768F400
G1 X83.834Y32.402
G1 X83.679Y33.04
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G1 X84.187Y31.138
; Cut @ 350 mm/min, 90% power
G0 X82.741Y31.379
; Layer C00
G1 X82.899Y30.982F350
G1 X83.04Y30.578
G1 X83.188Y30.216
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G1 S0
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G0 X0 Y0

Is there a specific reason you’ve done this? If not, I suggest you switch this back, both values to 1000.

Once you do so, can you use the Fire button in Move window and confirm you are able to modulate the power of your laser? Meaning that you can go from basically off to much brighter by increasing the power %.

I did change my $30 back to 1000 in both locations and restarted Lightburn. I have a scrap piece of baswood in the area right now.
I started at 20%, clicked “Fire”, let sit in place for 10 seconds then moved “X” 10mm and reduced down to 3% and flipped power switch after 10 seconds.

So with the process above, I would say Yes, the laser does change power levels when using the “Fire” Button. I do have to turn the laser off by flipping the physical controller power switch.

Also I was trying to see if $30 changes would help at all. I was trying to troubleshoot myself and wasnt sure if that would help. I thought I read on one of the forum posts that adjusting $30 could allow the start and stop of the laser when crossing “no cut” zones. I am a complete noob at this, but in the last few days have felt like I fixed a bunch of my issues, but not the cutting through no cut areas.

This is a little confusing. If you start at 0% power and gradually increase power, does the laser light get increasingly brighter? You should be able to do this without movement or any other change, just by pushing up on the power level button. Please confirm.

I interpret this to mean that in order to turn the laser off after firing that you can only get the laser to turn off completely by physically powering the machine off?

If so, you likely have one of the following scenarios:

  1. Faulty hardware. Likely either the controller or laser module is not behaving properly.
  2. Something miswired. I think this is less likely. Do you have any customizations to your hardware configuration or is this all stock hardware. You don’t specifically mention the laser module type. Is it made for the Falcon or is this generic?
  3. Corrupt or incompatible firmware. Is the firmware that you’ve used specific to your machine? If not, it’s possible the firmware is misbehaving.

I figured/thought you had to move and fire. So I started at 0 and went up to 20 and I could see the slight difference. So It does seem to be adjusting when I increase use the Fire button.


  1. It is Creality, so It wouldn’t surprise me.
  2. It is Stock, except for I did do a Firmware update.
  3. The firmware I grabbed it from this CV-Laser Module - Creality 3D the 3/8/23 dated

It being a slight difference is somewhat worrisome. The difference should be quite dramatic between 0 and 20%. But it sounds like it’s working in basic.

Are you absolutely certain this is the correct firmware for your laser module? I’ve never seen another laser module accept firmware upgrades.

Have you looked at firmware updates for the controller?

Do you have a voltmeter and are familiar with how to use it?

I can step my manual fire power up in 0.25% steps and from 0 to about 3%, every step (0.25%) is clearly visible. 0 is off (or not visible), 0.25 is clearly visible in a normally lighted room, but dim. 0.50 is brighter still, etc. I normally frame at 0.5 to 1.0%. Above about 3% it just starts burning if I don’t move the head and is too bright to clearly see the steps.

22W quad diode.

Nice. I tried this morning to do fill mocking jay and had it set to 3000mm/m and 30% and verified the Z height per the black aluminum stair gauge thing, and it went straight through it. I called amazon since they have a 90 day tech support and they said how would you like your refund! I bought a Ortur LM3 10w. I watched a few videos and reviews this morning and i pulled out my Aufero 1.5w lu2-2 little laser and other than cutting it did everything perfect that i asked it to do in Lightburn! Thats what made me choose an Ortur over some other’s. Plus I found some deals!

Thanks for all the help everyone!!

Thanks for the guidance. After your last posting the other day, I went on creality’s site again and tried to flash a few different firmware updates. I know your not suppose to do this but i really did not like the laser always being on with the CV-30 firmware I found. More or less, after each flashing, if the laser was on i moved on to the next one. After that and still burning a fill job, i called Amazon since I saw it had a 90 tech support with this purchase and when i asked them for firmware since Creality’s site stinks, they asked me how i wanted my refund and to send the laser back. So after i moved my 3d printer chaise out of the enclosure, i moved my little Aufero LU2-2 in there and it preformed how i expected… PERFECT! So i ordered a Ortur LM3 10W or a real laser setup, not some jerryrigged thing like i was making.

I appreciate your help and your comments led me to this instead of trying to troubleshoot and possible being stuck with a busted unit. It seems this unit should be right up my alley and allows for some upgrading after i sell a few things!

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