Over the years 3D printers have gotten safer, but at 3DUPfitters we think of them as an oven: even though they are perfectly safe they're still not something you'd want to leave unattended. It's very, rare, but just like an oven, it's still possible one could ignite.
And that's where this cool device from BlazeCut™ comes in. The extinguishing agent is stored in a tube you attach to the top of your enclosure. When a fire occurs the heat causes the tube to rupture, releasing the extinguishing agent. There's no power supply, nothing to calibrate, just a tube you install with zip ties.
BlazeCut™ uses liquified gas, HFC-227ea fire extinguishing agent. The agent is a worldwide known and accepted gaseous clean agent used for total flooding fire suppression applications with very high effectivity, zero ozone depletion potential, and safe to people. It's really the best choice for 3D printer enclosures:
Resistant to temperature changes
Leaves no residue
Does not damage equipment or objects
Zero ozone depleting potential
The above video was from Blazecut and used the Lack enclosure, but we wanted to test it with one of our all-acrylic enclosures to see what would happen. Unfortunately, it's winter here and 32 degrees outside, so the temperature inside the enclosure took longer to heat up to the trigger temperature. On the other hand, it was a good torture test that shows the acrylic did not catch on fire despite there being a large fire inside. We also didn't put the fire right under the sensor, which also would have triggered it faster.
Get the Correct Size
The BlazeCut™ T series comes in two sizes. The T100 fits small enclosures such as the Prusa or Ender 3, or medium enclosures such as the CR-10 or Ender 5 Plus. Anything where the longest side is under 35 inches. The T200 only fits the very largest enclosures like the CR-10 Max and S5, or any enclosure over 35 inches on a side. Be sure to order the right one for your enclosure.
The BlazeCut should be installed at the top of the enclosure, with the temperature sensor configured on the side of your printing containing the electronics since that's the most likely to catch on fire. If your enclosure doesn't have a support bar, the easiest thing to do is use the zip tie attachment points on the 3DUPfitters connectors as shown below:
If your enclosure has a support beam or isn't flat on the top you'll need to float the tube just below the top using this handy connector you can print yourself:
This can either replace the existing mid-panel connectors, OR you can drill your own holes and place them anywhere. Here's an example of a customer who located their BlazeCut off to the left: