Last night I turned my printer on as I was going to run some prints for the wife and I let the bed heating while I was working on the files. However, due a change of mind, the boss told me wait until she figured it out how she actually wanted the print to come out.
At this point, I thought it would be a quick set back so I went on and helped her with the new design and left the printer ON as I was planning to come back to it in few minutes.
Long story short, I ended up taking about 1h-ish and to my surprise, the printer was still holding the bed temp at 85C, meaning, it does not shut itself down after a period of inactivity or if left unattended.
Right next to it is my Prusa MK3S which times out after a few minutes if the print job isn’t started and requires user intervention to reset it.
This is serious! Please add some safety to your firmware ASAP!
So you told the printer to preheat to 85c and it did exactly what you asked it to do. If you wanted you could have just loaded up Bambu Handy and shut it down, was that not an option?
I am not opposed to safety additions but I normally need to preheat my chamber with the bed at 100c for 40+ minutes sometimes, it’s not a big deal the printer isn’t going to self combust or anything… but I can understand your concern. The printer does have thermal runaway protection if things go out of hand.
You can even go full on control and install a wifi smart plug to shut the printer off completely remotely if needed, I have that hooked up to my P1S just incase.
Maintaining a set bed temperature is a necessary feature. My printer is in a cool location and some filaments need a warm chamber to adhere or print properly. I would be upset if I found that the printer turned itself off when I needed it to preheat. I don’t see this as a hazard since the printer is designed to contain the heat. It’s not Bambu’s fault you were distracted and wasted some energy.
This has nothing to do with distraction or wasted energy but only with the fact that the printer simply does turn itself off after long period of inactivity.
I usually don’t like when the printer does thing I don’t know about.
That’s why I resolved this particular issue using home automation. I registered MQTT client to my printer’s broker, I’m monitoring status messages and temperatures and as soon as it is in “IDLE” or “FINISH” state with hotend or bed temperature higher than 40 degC for longer than 30 minutes, my home automation kindly asks me that the printer is about to be shut down yes/no and if I don’t answer “no”, it is shut down in 5 minutes.
I have given up all hope that BBL will deliver any useful features. What you don’t make yourself, you don’t have.
I’ve had filament run out in the middle of the night, and the printer ended up sitting idle, holding the bed temp for 6+ hours. (as it should)
Now I understand this is a different situation, but my point is it is far from dangerous. 3D printers are designed for this. A print bed staying at set temp isn’t dangerous, and is nothing like thermal-runaway, which can be very dangerous.
I sometimes use the printer enclosure to prove bread(!); auto-shutoff would not be desired. (You probably should not do this but I’m too old for it to make a difference anymore).
However I understand that it should be an OPTION in the settings for people that want it.
I note that the X1 has a program for filament drying.
as others mentioned, there is no real need for it, the printer has no problems with a hot bet even with 100C … i mean you can do a ABS print for 30+ hrs and the heatbed stays at temp. there will be no fire, its build for that …
I’m confused on how this is a safety thing. Ya maybe if you turned it on the went on a month long trip and forgot to shut it off but I do asa prints all the time at 90c bed and some of the prints are 2-3 day long prints of the printer holding the bed at 90c for 3 days straight
I am coming from a night and more (24 hours to be safe) whereas safe is “I wanted to be sure that the Kg of ABS a guy gifted me for try was dry as the Sahara” and I let the bed the whole day and nite at 65°C cuz wasnt the ABS worryng me but the spool not sure if it was PETG or PLA and would melt.
And here I am, my house went burnt and I’ve nowhere to go on Christmas Eve. Sad.
But no, it all worked like the time before and my ABS has perfectly dried out.
As far I know, if not Bambu sure other enclosed printers have a feature that heats bed and chamber in function to be used as a dryer.
So as someone said “I’m not against countermeasures and safety” it would be fool, but this time I have to refuse your Bambu Improvement Proposal since this function appears to don’t need it and it turns me handy as it is.
Like has been said before, many more people WANT this as a feature to pre-heat their chamber when printing high temp materials. You are likely the minority in considering this a fault and wanting it to shut off after a certain point of time.
The one solution to this would be having the OPTION to select a checkbox to cooldown after XXX minutes that would be off by default.
From what was described. The heater did auto shut-off. It reached 85c then shut off, then when it fell below that temp, it turned back on. I believe that’s called a “design feature”.
I think what you may be asking for is a user defined timeout feature such as what is found on the P1 Backlight. However, in the priority of feature requests, is this what the customers are demanding? I can think of a lot of other higher priority “asks” that were named here in this sub-forum.
