Yes.
I honestly would love to push a machine to cut a overnight job let’s say… It’s probably achievable but not without risk for sure!!! If I have to stay always in the room… It would really change the way I approach the LR3 quite honestly.
I really have to get my game together…
Accurate Sir. 
Sorry for your LR3 loss. Glad to see this wasn’t a much worse outcome. Thank you for sharing your experience. I appreciate the reminder of the risks, and how closely I should monitor machines, especially ones I built/assembled…
Installed thermal fuse in my 120VAC 3D printer heater bed to hopefully reduce risk of thermal runaway causing a shop/house fire.
Curious what automated safety sensor(s)/mechanism(s) could help avoid this outcome, or help avoid a much worse situation even? @kvcummins pointed out that room smoke alarm will be too slow to react. Curious what cost effective solution(s) would help?
Camera seems like a good option.
Speakers too who knows.
The jackpot board as a wifi module if I’m right. Maybe some smart gentleman have an idea for that…?
Let’s hope not! I’m glad you are OK and that the fire wasn’t much worse. It could have been.
Never, ever, leave a CNC router unattended.
Some things I see that are worth remembering-
PLA, when it is ignited, burns readily.
I discovered that the first time when I was troubleshooting my solidoodle workbench which loved to encase its’ hotends in leaking plastic. I mostly printed PLA, the SDW parts were mostly printed ABS. I was trying to de-goop it after one of its’ misadventures, and had the hot end heated up and on while I was trying to get the blob of plastic detached from the hot end. (DUMB! DON’T DO THAT!). I managed to work loose the thermistor, causing a thermal runaway of the hotend, and ignition of the blob. Did I mention that PLA likes to burn when you ignite it? I know of one person that is experimenting with small rocket motors built with PLA infused with oxidizer. There’s PLA on the core, and it’s just another of the countless reasons not to leave a CNC router unattended. Once the core ignites, now the router is coming off, just as it is shown in your picture.
Jeffe mentions this down below, but there’s no substitute for your own senses. You’ll hear, smell and even feel when the machine is in trouble long before a smoke detector or IR sensor will be able to alert you that things have gone south.
It’s great that you clearly had a fire extinguisher. Even better that it looks like it was a dry chemical extinguisher. For the rest of us, it’s a reminder that some extinguishers are bad for some environments (e.g. keep water based extinguishers away from electrical machinery…)
I just took a couple of minutes to check all the ones I have and realized that one I keep in a vehicle is way expired. We should all stay on top of our safety equipment. Now’s a great time for all of us to take a moment and double check our safety gear.
Not that it would have helped at the start of this event, but did you have an e-stop of some kind on this machine? Were you able to hit the e-stop before you employed the fire extinguisher?
Finally, I’m curious about the job(s) you were running. Were those a series of cuts you were repeating in different places, or was it one large job that failed? Since the cuts look full depth to me, I suspect the former. Also that there are 3 removed parts from the work piece. Based on the way the 4th part has some knarly cuts, this was going south for a good while before it caught fire.
Please reconsider the idea of running a job overnight, and if you really need to run things that long, then you need and operator to be with the machine all throughout.
I’m stealing that image
A viking low rider funeral…
Too soon??
Seriously, that really sucks. Sorry to see that happened to you.
I help oversee the fire department check all the extinguishers at work. When they start replacing them there I know to replace mine. They also do testing and refills for less than new ones (note they can’t refill all of them)
Finally, I’m curious about the job(s) you were running. Were those a series of cuts you were repeating in different places, or was it one large job that failed?
Not even. I was trying to cut the Doug’s parametric table design. Check the first pass, was all good. The CNC failed around the 2nd or 3rd pass…
Please reconsider the idea of running a job overnight, and if you really need to run things that long, then you need and operator to be with the machine all throughout.
Still dreaming! 
Is that the rubber stops still in the rails? I wonder if that caused it to bind when z went down for another pass. Those should be removed once the rails are installed and screws put in those spots
Good to know! Learning… learning…
The heat probably melted/deformed the inner workings of the linear bearings.
Oooof dang man thanks for sharing glad your ok.
It’s amazing how fast things can go south.
I’m telling you, close to 2 minutes
Is that flame retardant filament? …too soon? 
It’s all good hehe
Maybe you should have chosen black filament. It’d match the decor better.
