Printing PETG and get a Chamber Temp alert (and also happens with PLA)

Bambu Lab H2 Series
1

I have had my H2C since December. It has printed quite a bit since then, but I am getting issues with chamber temperature printing PETG or PLA. My X1C that I have had for a number of years sits in the same room and has never had this alert, even when printing the same model at the same time - they sit along the same wall, about a metre apart.

It started that I would get an alert saying that the fan was going to be increased due to the chamber temperature being too high, and I noted it was around 41 degrees C when that happened. when that happened, I generally went in also and bumped up the exhaust fan 10% and it was fine after that.

However, lately the print just stops altogether claiming that the chamber temperature is too high and wants me to open the front door or the top cover - and this can be with the first 40 layers. I have never, ever had to do this on my X1C, even when printing PLA, so is the H2C just way too sensitive or do I have a setting set wrong somewhere. At the moment I am printing with PETG with the front door open because of this, and the room has a ceiling fan running and a cross flow of air through a large window, it just makes no sense to me.

This can occur when using the Engineering Plate (it runs a little hotter for the bed temp), or with the standard Textured build plate, with default bed temp settings. With PLA and the SuperTack plate, I can get an alert, but it does not stop, or hasn’t yet, but I mainly print with PETG and the Textured build plate and see the alert often, the stopping the print is more recent.

Can anyone offer any advice as to what I need to be looking for please?

Chamber Error
Chamber Error352×373 27.3 KB

Thanks in advance.

2

I often have this problem here (in Thailand) because the ambient temperature is often above 35°C. When that happens with PLA, I remove the top glass panel; it’s better than opening the door because of the printer’s movements.

I believe (but need confirmation) that it’s related to the filament’s “Softening Temperature” setting, so it shouldn’t happen with PETG, which should have a value of around 70°C.

3

Thanks for the reply, yeah I thought the same thing and expect in very hot days this could be a thing. Today it is cooler and raining and the ambient temp is very low compared to other days, but it reached 43 degrees and stopped. I just know if I ran the same job on the X1C and it hit 43 degrees, it not only would continue, but finish flawlessly.

It is just very annoying, I have some big 24hrs prints scheduled and can’t have this stop when unattended.

4

Did you try to change filament setting : Softening Temperature ?

5

I did not know that was a thing. Will look for it - but not sure why it needs changing, even Bambu filament has this problem, so it must just be my room. Is 40-43 degrees too hot for PETG, I wouldn’t think so, but my H2C does not like it.