I posted this on Bambu Studio Github, and out of the blue it occurs to me that this wouldn’t be controlled through the slicer, so posting it here.
I assume this may be true for the entire H2 family, my only experience is with an H2S.
When printing a filament that does not require a heated chamber, the machine will enable the exhaust fan as necessary to keep the temperature in the chamber from rising too high. This appear to happens when the chamber hits 35c. For PLA at least, it may be different for PETG
The issue, in thermostat terms, is that there is no differential or swing value. The ambient temperature in my home office is cool and that causes the exhaust fan to go from off to on back to back multiple times, opening the top vent and the rear as well each time. At first I found it funny, but the more it happens it has become a nuisance. The noise of the vents opening and closing is very distracting if you are in the same room and loud enough for someone on the phone to hear and ask what the noise is.
If there were a differential, I originally thought a fraction of a degree but since this occurs for materials that do not require a heated chamber, the swing could be a value of 2-3 C which I wouldn’t expect to effect the print (and really, even a “heated chamber material” the printer will start printing before fully heated and that isn’t effecting those more sensitive filaments), then it could turn on at 35, but then not off until 32. This at least gives some time between when it activates and then only has one action until it his the low temperature swing setting – so occurring less often and less noise per occurrence.
