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Printer fire hazard

Posted by garyhlucas 
Printer fire hazard
February 10, 2018 11:14AM
I have been very worried about a printer fire for overnight printing. So I got a metal double door wall cabinet (came with feet too) to enclose the printer. Still you could have a fire potentially producing a lot of smoke which would be bad. I think I have a cheap solution. I got an old style CO2 bike tire inflator turned from aluminum. I am going to plug the end that attaches to the tire tube with Roses metal that melts at about 200F. It’ll poke through a hole in the top and the 20 gram CO2 cartridge will snuff out the fire without damaging the printer. A second woods metal fusible link will open the power circuit at 158F first so the heat source is disabled before the extinguisher.

This along with a smoke detector in the printer room should be as safe as possible without going completely crazy. About $50 total.
Re: Printer fire hazard
February 10, 2018 12:40PM
The fire will die out quickly in a closed cabinet.
It takes force to punch a CO2 cartridge. You will need a system inspired from a hand grenade firing pin to punch it (they are battle proven to work in adverse condition smiling smiley ). You can't punch it in advance and rely on a valve that is likely to leak or block in the long run.


"You failed to maintain your weapon, son" (Harry Brown )
Re: Printer fire hazard
February 11, 2018 01:25AM
I think it's a great idea but I think you may find it requires more engineering than it appears at first glance. My first thought is that you need to be really sure that the thing is still... armed, which to me means either that the bulb is only punctured when the system activates or that you have some sort of pressure gauge to reassure you that the CO2 hasn't leaked away.

Idris


{Precision Piezo} Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters.
DLF
Re: Printer fire hazard
February 11, 2018 02:09AM
Sounds like an interesting idea! But I agree with previous posts; if you do not have some way to either puncture the tube when fire starts or pre-puncture and monitor pressure it might just lead to a false sense of security. I too worry about fire and would be very interested in a solution like this. Please keep us updated!
Re: Printer fire hazard
February 11, 2018 06:29AM
Perhaps consider one of these fireball systems which burst when heated and hang it in the cabinet.


[www.precisionpiezo.co.uk] Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters. Coming soon PT1000 cartridge sensors plug straight into duet boards.
Published:Inventions
Re: Printer fire hazard
February 11, 2018 08:02AM
You don't have to invent everything. I always try and look for things that already exist.

[www.ebay.com]

or

[www.ebay.com]

Both under $100 and a higher probability that they would work than something I cobbled without the testing needed to insure function.

How about a large plastic bag of sand suspended over the printer that would melt and spill in a fire?

How about a smoke detector in the enclosure to warn you?

A thermocouple that would sense heat and cause an action (maybe roll the unit outside?)

How about setting the printer on a spring loaded platform that is held cocked by a thin rope strung over it, that would melt in case of a fire and fling the unit out a window?

A halon bottle with a fusable plug to melt and blow out the fire? $$$$ but you can't put a price on safety!

So many options, my current focus is on keeping my printer from starting on fire in the first place.
DLF
Re: Printer fire hazard
February 11, 2018 10:56AM
The "stove" extinguisher contains a fire suppressant that will corrode the printer. It will likley stop the fire but any part of the printer that survived the flames will be destroyed by the fire suppressant. The other one seems like a better choice. An "clean" fire suppressant like co2 is preferable for this reason.

Att what temperature does a co2 cartridge rupture when heated? I remember Them saying something like "do not store in temperatures above 50 degrees celcius". But I guess that statement has some saftey margins. IF it does rupture I guess it would burst at the weakest point, likley where you normaly pierce it.

Anyone got a cartridge to spare and want to try it out? grinning smiley
Re: Printer fire hazard
February 11, 2018 11:31AM
Have you considered careful examination of the printer and trying to reduce the risk of a fire starting?

Putting out a fire after it starts is like closing the barn door after the horses have run out.


Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: Printer fire hazard
February 11, 2018 12:11PM
We all do that, or should do that as a matter of course. However some things are only apparent in hindsight, if something completely unexpected occurs I'd rather have something that deals with the problem caused by an accident rather than relying on predicting every eventuality beforehand.

Idris


{Precision Piezo} Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters.
Re: Printer fire hazard
February 11, 2018 12:29PM
How many 3d printers have started a fire?
DLF
Re: Printer fire hazard
February 12, 2018 12:46AM
Quite a few. Do some google searches om the subject. Sure, most have been cheap kits with substandard electronics and thermal runaway disabled. But the potential to start a fire is there in all printers.

the_digital_dentist; why not do both if the extra protection against unforseen risk can be had for a reasonable cost?
Re: Printer fire hazard
February 12, 2018 12:46AM
Anyway, in a well closed steel cabinet, the fire will die out.


"You failed to maintain your weapon, son" (Harry Brown )
Re: Printer fire hazard
February 12, 2018 04:17AM
I wouldn't uses the Roses metal as its difficult and local.
I believe the tyre kits come with a connector to attach to the tyre. If you modify this and fit a plastic pipe instead of the tyre you can route the pipe all round the cabinet. The pipe can have a nice low melting point - say 100C. This will melt where it is hot and deliver the C02 at the melting point. I wouldn't think you will get 100C anywhere in the cabinet apart from contact with the bed or hot end. By the time you got the entire cabinet hot enough to melt the metal i would expect a major fire to be underway.
And the canister is outside the cabinet - you just feed the plastic hose through a hole.
Seal the blank end with a screw and some heat shrink tubing.
I guess you will get a shot of air from that traped in the tube but the C02 should clear that.
Not sure what volume of C02 the cannisters contain but it needs to be sized for the cabinet.
Re: Printer fire hazard
February 12, 2018 07:07AM
Quote
MCcarman
I wouldn't uses the Roses metal as its difficult and local.
I believe the tyre kits come with a connector to attach to the tyre. If you modify this and fit a plastic pipe instead of the tyre you can route the pipe all round the cabinet. The pipe can have a nice low melting point - say 100C. This will melt where it is hot and deliver the C02 at the melting point. I wouldn't think you will get 100C anywhere in the cabinet apart from contact with the bed or hot end. By the time you got the entire cabinet hot enough to melt the metal i would expect a major fire to be underway.
And the canister is outside the cabinet - you just feed the plastic hose through a hole.
Seal the blank end with a screw and some heat shrink tubing.
I guess you will get a shot of air from that traped in the tube but the C02 should clear that.
Not sure what volume of C02 the cannisters contain but it needs to be sized for the cabinet.

He said it was a 20g CO2 canister.


"You failed to maintain your weapon, son" (Harry Brown )
Re: Printer fire hazard
February 16, 2018 06:18PM
I bought two cylinders so I can test fire it. After puncturing cartridge I will bubble test for leaks. Might have to use locktite on cylinder threads for long term. Simple weight check to be sure it hasn’t lost any. CO2 won’t damage printer. Yes the metal cabinet may snuff the fire but lives are at stake not just the printer. Yes there will be a smoke detector too.
Re: Printer fire hazard
February 17, 2018 01:18AM
You can also get much larger 88g co2 cartridges and if even that's not enough you might look at sodastream cylinders or welding gas, I believe both of those have adapters commercially available.

Idris


{Precision Piezo} Accurate, repeatable, versatile z-probe plus piezo discs, endstop cables, pt100, 50w heaters.
DLF
Re: Printer fire hazard
February 17, 2018 01:26AM
It will will be interesting to see how this worksthumbs up
DLF
Re: Printer fire hazard
February 19, 2018 07:08AM
The sodastream ideal seems great in my mind. A used sodastream could donate the screw om valve/seal. Those things will have to hold the system pressurized and ready to use when operated as intended. Adding a termo-trigger (I like the hose-idea that was suggested) and pressure gauge would give a quite powerful automatic extinguisher.
Re: Printer fire hazard
February 19, 2018 01:29PM
Save the planet, no more CO2 in the atmosphere please.
I even stopped drinking soda !


"You failed to maintain your weapon, son" (Harry Brown )
Re: Printer fire hazard
February 20, 2018 06:26AM
Quote
MKSA
Save the planet, no more CO2 in the atmosphere please.
I even stopped drinking soda !

You know all those Fat people in the 7-11 with a trolley full of huge bottles of fizzy goodness,
I now realize they are not Fat, just full of CO2
Though Now the Climate has changed, and this kind of joke is victimizing CO2 Addicts.

This net sleeve stuff to hide wires burns really easy.

Edited 1 time(s). Last edit at 02/20/2018 06:29AM by MechaBits.
DLF
Re: Printer fire hazard
February 22, 2018 08:40AM
Quote
MKSA
Save the planet, no more CO2 in the atmosphere please.
I even stopped drinking soda !

In a best case scenario it will never get emitted to the atmosphere winking smiley
Re: Printer fire hazard
February 22, 2018 01:46PM
You could always use oxygen instead to save the planet!
Re: Printer fire hazard
February 22, 2018 02:18PM
Meh. So much better a little CO2 than the CO2, CO, H2S, HCl and other noxious substances that an electronics and plastic fire will emit.


Prusa i3 / Arduino Mega 2560 / RAMPS 1.4
Kit from a2aprinter
Beltless redesign in progress to move to T8 lead screw drive

MBot3D Printer
Kit from Amazon
Some teething pains, but a reasonably good printer, just missing a heated bed.
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