These are not for electrical fires which in most cases is what a printer fire is since it involves live electrical components. This is designed to smother a fire from the top down. If the fire is under a surface this cannot get to like your print head then it will not work. It is designed for grease fires and no other type of fire. If you are really concerned about a fire
your best option is to place the printer in a fire proof enclosure like metal or brick. Then add a system that will remove electrical power from inside of that box in the even of a fire. Most of the printers you have heard fire of have been cheap Chinese Prusa knock offs that are made mostly of plastic and have plenty of material to burn.You could also get a printer made of all metal except the circuit boards and that would be almost fire proof as there is not enough material to cause a fire that would be able to reach more than a few inches.
You may also want to read the feedback on those. Seems some one is unloading near expired or beyond expired products.
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