3D Printing at Night: Is It Safe?
Most often, owners of 3D printers would have printers with limited build capacity yet they would want to make the most of their machines, so when they have high-volume print jobs, they would just let the printer run overnight so their work gets done on time. But a baker would not leave a cake to bake in the oven overnight, so is it safe to keep a 3D printer operating overnight?
Why Do People Keep Printing Overnight?
- Size constraints: Most often owners of 3D printers would be small-scale manufacturers with tight deadlines and maybe one or two 3D printers. The building capacity of these machines would be far less than the planned production volumes. To print multiple objects, they would have to reset the 3D slicer and the G-code which would cut into the operational time of these machines. To save time, the owners of these machines leave the printer running overnight to print similar components or components with the same print parameters.
- Time constraints: Large objects take a longer time to get printed, and interrupting the print abruptly would negatively affect the precision of the print and would affect the texture of the product, this is undesirable, so they leave the -printers running so that they can get a well finished product with no blemishes.
- Obsolete technology: Top-end 3D printers come with a resume function that allows users to pause the print as and when they please and they can resume the print from the same position when they are ready. Older models do not have this feature and pausing the printing process is either impossible or pausing the printing process would damage the final product. Here users have no or limited choice but to keep the printer running.
- It is convenient: Waiting for a 3D printer to finish a print job is a tedious task, especially when the print volume is high or the size of the product is high. Instead, users would keep it running overnight while they get some rest.
What could go wrong? 3D printers are electrical devices with heating devices that are running at temperatures above 2000 °F so as to keep the filament molten for printing. The machine would also have cooling fans which are also electrical devices that have to perform well to keep the temperatures under control. Prolonged operation of these components could result in overheating of the equipment and lead to fires. The fumes generated during the burning of the printing filaments are toxic and could be especially dangerous if the printing is happening in a room without proper ventilation.
Toxic fumes would build up in the room making it dangerous to be in the room or to enter the room. However, all this might raise a question; if it is a matter of prolonged operation, what difference would it make to keep a 3D printer running all day from sunrise to sunset for 12 hours? The key point here is supervision. These hazards could happen at any time, whether it is during the day or it is at night. Although it is not advisable to keep a 3D printer working overnight, supervision could make a difference here.
A supervisor would observe the printing process carefully and take necessary action in case of an emergency. At night there are very few people with the energy to interrupt their sleep to check on the progress made by the printer, hence most fire incidents related to 3D printers happen at night.
What Are the Causes of 3D Printers Catching Fire?
1. Overheating of Electrical Components
Components such as wires may have coatings that are not built to resist high temperatures for prolonged durations. Most fires started by 3D printers are electrical in nature and occur when the insulation on the printer's wiring melts from overheating. If this happens, the wires may conduct heat to the 3D printer, melting the frame, filament, or structural components, and finally setting the device ablaze from within.
The majority of 3D printer fires that are electrically linked are caused by poorly constructed printers. There is a considerable chance that printers with loose solder, inadequately shielded connections, and missized wires will eventually catch fire. This indicates that getting a 3D printer from a reputable manufacturer or making sure it is built properly are the easiest ways to prevent fires.
2. Faulty Thermistor
During the printing process, the plastic filament is heated to the point where it becomes liquid. The extruder then pushes the filament out, creating a layer of printed material. Some 3D printers also employ a heated print bed to reduce warping and control how quickly the filament cools. The printer will therefore continue to heat up while it is producing something.
The printer uses thermistor temperature reading technology to regulate temperature and avoid burning filaments. Thermistors interface with the printer's circuitry to control how much heat is produced, and a sensor measures the temperature. Sometimes these coils may be faulty and might not be able to sense high temperatures, leading to conditions that cause short-circuiting and sparking within the printer and resulting in a raging flame. It is therefore important to ensure that the thermistor is functioning properly.
3) Malfunctioning Thermal Runways
The majority of the acrylic and plastic parts, including filament, used in 3D printer production are quite flammable. If the heat is allowed to build up unchecked, the printer's case, filament, or other components could melt and eventually catch fire. As a result, most 3D printers incorporate a thermal runaway mechanism that disables the printer if it becomes too hot. The thermal runaway safety feature keeps the 3D printer from catching fire if the thermistor malfunctions or gets loose. If the thermal runaway is made incorrectly or is unable to detect the thermistor's heat level, flames will surely follow.
3) Flammable 3D Printer Casings
Given how frequently printers made of cheap, combustible materials catch fire while printing, high-quality thermal printers can be expensive, but they are usually justified. Foam, acrylic, plastic, and wood are suitable materials for the structural components of a 3D printer since they can hold all the parts together. The probability that the printer may melt into a hot mess is considerably increased while using it while employing these flammable parts.
4) Extruder Jamming
The warm extruder will move, depositing small layers of melted filament onto the print bed as the model prints. The sculpture is built using heat by the extruder, but if the heat doesn't have time to cool between layers, there could be a major fire risk. However, if the print fails and the extruder cannot move appropriately, it may be blocked and kept immobile on the produced model. When this happens, the model could become so heated by the extruder that it starts to melt and catch fire. This may also be attributable to the filaments' inherent flammability.
5) Lack of Ventilation
Especially at night, the surroundings are cool which requires the heaters to work more to keep the filament molten, the heat generated would not have a proper venue to leave the room after a level of saturation, leading to overheating. Ventilation is also required to remove the toxic fumes generated during the process of 3D printing.
6) Lack of Supervision
At night most people would be too tired to monitor an object geting 3D printed. It is a tedious task and a very slow process depending on the size of the print. Therefore most people leave the process and the machine unattended causing fires and other malfunctions, their absence makes it difficult to respond immediately.
Should You Keep Your 3D Printer Printing Overnight?
Several factors determine whether it is safe to leave a 3D printer running overnight. The most important factor is the type of 3D printer you have. A cheaper, lower-quality 3D printer shouldn't be left on overnight since it can overheat and catch fire. In general, if a 3D printer is of higher quality and was designed for industrial usage, it is safe to leave it running overnight. Another thing to consider is the material you are printing on.
Some materials, including PLA, are not recommended for overnight printing because they could produce harmful fumes. One of the simplest ways to expedite the printing process is to leave a 3D model to print overnight. The vast majority of printers are not designed to function on their own. Additionally, it is well known that 3D printers pose a fire risk. You can lessen your risks by implementing various management and risk-reduction strategies.
Poorly built 3D printers could have faulty thermistor sensors that lead to overheating and fires. The stress may eventually cause cables to crack and melt. An electrical short in a wire could also ignite a fire. Never leave a printer running unattended. In addition to remote monitoring, Octoprint provides video feeds, status updates, and GCode visualizer. With the help of this tool, you can monitor, control, and — if your 3D printer starts operating outside of set restrictions — shut it down. Thermal runaway is commonly caused by a thermistor that is improperly installed, loose, or ineffective. On 3D printers, the thermal runaway protection feature is turned on by default. If the 3D printer will be used overnight, a smoke detector can be a wise choice.
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