Bambu Lab makes some of the fastest and most capable consumer 3D printers on the market. The X1C, P1S, and P1P have built a massive following because they print fast, print reliably, and require less tinkering than most alternatives. A lot of people who own one run them overnight. A lot of people leave them printing while they are at work. And a lot of those same people have been paying attention to the fire safety conversation that has been getting louder in the Bambu community over the past couple of years.
In 2024, Bambu Lab recalled the A1 series due to a cable design that could stress and arc when the machine was tilted backward. In early 2026, reports resurfaced about a power board component issue on the A1 involving an NTC that could generate enough heat to melt surrounding plastic components under rare surge conditions. Bambu addressed the issue with a board redesign in Q3 2025. The company stated no fires were reported and that failure rates were extremely low.
That is reassuring, but it also illustrates something the 3D printing community has known for a while: even well-built printers from reputable manufacturers can develop fault conditions that generate heat in places they should not. The question is not whether Bambu Lab printers are safe. The question is what happens inside an enclosed print chamber if something does go wrong when nobody is watching.
The Gap in Bambu Lab's Official Accessory Lineup
Bambu Lab now sells an Auto Fire Extinguishing System for the H2D, H2D Pro, and H2S printers. That is a meaningful step and it reflects how seriously Bambu is taking the fire safety question for their enclosed printer line.
The X1C, P1S, and P1P do not have an official Bambu fire suppression accessory. For the hundreds of thousands of owners of those printers, particularly the ones running with third-party enclosures or using the P1S which has a built-in enclosure, there is no Bambu-sourced suppression solution available.
The BlazeCut T Series fills that gap directly.
Why Enclosed Bambu Printers Carry Specific Fire Risk
The X1C and P1S are enclosed printers, which is one of the things that makes them excellent for printing ABS, ASA, and other temperature-sensitive materials. The enclosure maintains consistent chamber temperatures and contains fumes and particles.
It also means that if something goes wrong inside the print chamber, the fire is inside a sealed box with nowhere to go. An open-frame printer that catches fire is bad. A closed printer with an active fire inside a sealed enclosure is a faster-moving and harder-to-respond-to situation.
The specific failure modes worth understanding:
Electrical faults and component failures. The A1 issues highlighted a real category of risk: electrical components inside a 3D printer can fail in ways that generate heat beyond their normal operating range. Power boards, MOSFETs, heated bed connections, and hotend wiring all carry current and generate heat. A fault condition that is not caught by thermal runaway protection can result in a heat event inside the printer chassis.
Thermal runaway protection limitations. Bambu Lab printers have thermal runaway protection built in. Like all thermal runaway systems, it monitors temperature at specific sensor locations and shuts the printer down if readings look wrong. What it does not cover is a fault that originates outside the thermistor circuit, or a smoldering issue that develops slowly enough that the firmware response is not triggered. Thermal runaway protection shuts the printer down. It does not suppress a fire.
Third-party enclosures. A large portion of X1C and P1P owners have added third-party enclosures from companies like Clearview Plastics. These are purpose-built, well-engineered products, but they create a larger enclosed volume around the printer that does not have any built-in fire protection. A fire starting inside the printer and spreading into the enclosure space has more room to grow before anyone notices.
Overnight and unattended printing. The Bambu community runs long prints. The speed of Bambu printers means people push them to their limits, running overnight prints and multi-day jobs. The periods of unattended operation are where automatic suppression makes the biggest difference.
How BlazeCut Works in a Bambu Printer Setup
The BlazeCut T Series is a pre-charged flexible tube that mounts inside the enclosure you are protecting and responds to heat without any connection to the printer's electrical system. No wiring, no power source, no firmware integration. The tube is both the heat sensor and the delivery mechanism for the FK-5-1-12 clean suppression agent inside it.
When temperature inside the enclosure reaches the activation threshold, the tube opens at the hottest spot and discharges FK-5-1-12 directly onto the source of the heat. It responds in the first seconds, inside the enclosure, before the fire has time to spread.
FK-5-1-12 is a clean gaseous agent. It leaves no residue, no powder, no water. In a printer with precision motion components, a multi-color AMS system, electronics, and a build plate with a print on it, a dry powder discharge is a secondary disaster. FK-5-1-12 suppresses the fire and dissipates cleanly.
For the P1S with the built-in enclosure: The P1S enclosure is a defined interior volume. A T Series tube sized to that volume mounts inside the chamber using zip ties or small brackets and covers the space without any modification to the printer itself.
For the X1C with a third-party enclosure: The X1C with an external enclosure has a significantly larger interior volume that requires a longer tube to cover adequately. Size to the total interior volume of the enclosure you are using. The sizing guide on the product pages walks through the calculation.
For the P1P without an enclosure: An open-frame printer without an enclosure is not a candidate for tube-based automatic suppression. The agent needs a defined enclosed space to build concentration and suppress effectively. If you are running a P1P without an enclosure, adding fire suppression means adding the enclosure first.
Choosing the Right Tube for Your Setup
Sizing the BlazeCut tube correctly is the most important part of this purchase. Here are the accurate numbers for the most common Bambu setups.
P1S with the stock built-in enclosure. The P1S internal print chamber is 256mm x 256mm x 256mm, which works out to approximately 0.59 cubic feet of gross interior volume. After accounting for the printer body, motion system, and AMS if installed inside the chamber, the net open volume the agent needs to fill is roughly 0.4 to 0.5 cubic feet. A TR050FK covers this range comfortably.
X1C with a Clearview V2 external enclosure (standard 24-inch height). The Clearview V2 standard enclosure is 22 inches wide by 23.5 inches deep by 24 inches tall, giving a gross interior volume of approximately 7.18 cubic feet. After accounting for the printer body inside the enclosure, net volume is roughly 5.5 to 6 cubic feet. A TR400FK is the right starting point for this setup. Depending on the exact configuration, two tubes covering separate zones may be worth considering for more complete coverage.
X1C with a Clearview V2 external enclosure (tall 31.5-inch height). The tall version comes in at approximately 9.4 cubic feet gross, or roughly 7.5 cubic feet net. This is a large enclosed space. Two tubes, such as a TR400FK supplemented by a second shorter tube covering the lower zone near the build plate, is the better approach for complete coverage.
For any other enclosure, measure the interior dimensions in inches, multiply length x width x height, divide by 1,728 to convert to cubic feet, subtract roughly 20 to 30 percent for the printer body and components, and match that net number to the sizing guide on the product pages. If you are not sure, reach out before ordering and someone can help you get it right.
FAQ: BlazeCut for Bambu Lab Printers
Does Bambu Lab officially endorse BlazeCut for the X1C or P1S? Not currently. Bambu Lab offers its own fire suppression accessory for the H2D series but does not have an official suppression solution for the X1C, P1S, or P1P. The BlazeCut T Series is a third-party solution sized and installed by the user. Prusa Research does officially list BlazeCut as the enclosure fire suppression add-on for their printers, which gives a useful reference point for how tube-based suppression is being integrated into the 3D printing ecosystem.
Will the activation temperature cause problems during normal printing? No. The activation temperature of approximately 248 degrees Fahrenheit refers to the ambient temperature inside the enclosure at the tube location, not the hotend or heated bed temperature. Enclosure ambient temperatures during normal Bambu printing, even with the chamber heater active, stay well below that threshold.
Can I install it without modifying the printer or voiding any warranty? The tube mounts inside the enclosure with zip ties or small brackets and has no connection to the printer's electrical system. No modification to the printer itself is required for a standard installation.
Does FK-5-1-12 damage the AMS, motion system, or electronics if it discharges? No. FK-5-1-12 is non-conductive, non-corrosive, and leaves no residue. It is safe for electronics, precision motion components, and the AMS system. After a discharge, ventilate the enclosure, assess for fire damage, and replace the tube before printing again.
What tube size do I need for my specific setup? It depends on the interior volume of your enclosure. The P1S stock enclosure is approximately 0.59 cubic feet gross and needs a TR050FK. A Clearview V2 standard external enclosure is approximately 7.18 cubic feet gross and needs a TR400FK or multiple tubes. Use the sizing guide on the product pages or reach out before ordering.
What do I do after the system discharges? Do not open the enclosure immediately. Wait for the agent to fully disperse, then ventilate the space before handling anything inside. Remove the used tube, assess the printer and enclosure for damage, and replace the tube before running another print. Replacement tubes are available directly through Modern Fire Suppression.
Protect Your Bambu Setup
The right BlazeCut T Series tube for your specific printer and enclosure configuration is available at the link below. Use the sizing guide on the product pages to match the tube length to your enclosure volume, or reach out before you order and someone can help you get the right fit.