Interesting. I wonder what their use-case was in the design meeting 
Probably safety - cuts the beam if anyone moves it
My apologies for questioning it. I’ve not come across it before.
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I’m having the exact same issue running a K40 on GRBLHal on a Teensy4.1. Basically while doing an engraving it will stop for a quick second and then start up again where it left off but in a different position. I can tell you that the Alarm 3 is likely not your issue. The Alarm 3 is being thrown when you press the “Stop” button after the job fails. I confirmed this by pressing the “Stop” button during a normal job that didn’t fail and it also throws the Alarm 3. Watching the console, when the glitch happens the controller doesn’t report any issue. That and the spurious nature of the problem has got me quite frustrated. I’m thinking it may be a result of communication through the USB getting garbled causing GRBL to throw out a set of unreadable instructions and then pick up again on the next readable instruction. Since raster g-code are all relative moves it doesn’t go to an absolute position when it picks back up. I’m hypothesizing here. Let me know if you have figured out the issue.
Hopefully you’ve gone through all the things to eliminate USB cable/signal issues.
What computer OS, are you rastering( as opposed to lines ) and have you tried cutting speed in half and verified it still does/doesn’t happen?
I have not figured out what the issue is, but it is really irritating that it keeps happening. I tried using my laptop and my desktop and it happens either way. I am running windows 10
I have ran from 1200 to 3000 and I happens regardless
Did you replace your USB cable with a top quality shielded and ‘choked’ cable?
Did you verify your computer and laser are connected to the exact same AC power outlet?
Did you verify your USB connectors are not loose or in any condition which can cause a poor connection?
Have you tried using a powered USB hub between the computer and the laser? Again powering all from the same AC phase(outlet)?
On the Window side, you’ll have to google for all the things which Windows does to your USB port like powering it down, probing it for virus’s, etc etc.
if you know Linux, make a bootable USB thumbdrive of Ubuntu 18.04 and run Lightburn from that and see if the problem goes away. If not, it’s still a hardware issue, otherwise a software/OS issue.
that looks like you more then doubled the speed instead of lowering it. Is 1200 and 3000 speeds in mm/min?
Yes it is.
then I would switch it to mm/sec and slow it down… Did you say you tried at 1200 mm/min? That should be 20 mm/sec and a good slow speed test. If you don’t know, the firmware runs in mm so best to use mm instead of inches if you had it in inches.
Most stopping issues are related to either USB cables/connectors, powerline noise(furnace/motor turns on) or Windows power saving settings.
if you look on the console of Lightburn you will probably see Alarm 3 or something like it.
Alarm 3 is “reset while in motion”.
Yeah,
ALARM:3
Reset while in motion. Grbl cannot guarantee position. Lost steps are likely. Re-homing is highly recommended.
Is what I get every time I happens
So you really need to answer the questions I posted…Laser stopping half way through burn - #19 by DougL
most likely communications issues as mentioned previously.
I do not have the fancy USB cable, but I have made sure that they are not loose. The computer and laser are both hooked up to the same power strip. I do not have a hub, I have gone into windows and turned off the power sleep mode for the USB settings.
Can you recommend a cable that I might be able to pick up at Walmart?
I would think that any which go to the effort of mounting a choke on them would be a good choice.
A choke is recognized by a large cylinder in the normal part of the cable and is usually near one or both ends of the cable.
Like this one:
https://www.walmart.com/ip/Tripp-Lite-USB-2-0-A-B-Gold-Device-Cable-with-Ferrite-Chokes-3/21732224
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hi, i also have the same problem! error 1. error 2.
Error 3. errorr 20. seems to finish the job and then starts over from random locations. from SD card same problem! and furthermore the frame is not correct with the size of the machine.
Guys, I figured it out! It was my power supply!
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So, I noticed that the green light on my power supply faded when my laser would stop. I looked at it and replaced it with the power supply for my Bluetooth speaker. It was the same input and output voltage and wattage. It now works like a champ!
I do want to thank everyone for the help and solutions that you provided me with.
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they must be shaving pennies to get parts to make these things. I would not have expected such a low power PS to fail. Go figure but cool you figured it out. Will try to remember that for the next person who posts with similar issues. And Ortur has been having issues from day one with resetting GRBL controllers so much so LightBurn added feature to retry sending when the Ortur disconnects.
Could be lots of junk PS’s out there…