I think it does, though I’d have to check what direction the wind blows. It’s definitely a plausible theory.
That wouldn’t explain the wobbly up and down power usage on ramp up, where the print head is very high, so any fan exhaust wouldn’t blow on the bed as strongly, I suspect.
Man, snapmaker support can be infuriating, though I admit perhaps my flood of data I sent them probably caused their AI to overload and drop context. They replied that since I’m reporting a ±2 degree variation, that this is normal (and they say the dual-extruder doesn’t impact power usage, which is CLEARLY wrong).
Mind you, they completely ignored the rather massive and lengthy temp-drop after 7-8 minutes (EVERY TIME) and how that’s what the whole support thread has been about for months now).
Sigh. Does anyone want to buy my printer? I’m so tired of snapmaker.
I know this issue, and tried all the same things to get rid of it - without success. My machine always entered panic state.
My room is a little bit warmer, but also in the basement.
My only observation to add: it depends on the target temperature: If I try to reach 90 degress for ASA/ABS, the print is very probably to fail with Snapmaker entering panic state (I tried even 5 prints in a row).
Going to a target temperature of 88 degree worked without any problems, independent from which of my heating beds I used.
So my conclusion is that it has to do with the required power but didn’t invested too much to investigate. Maybe the firmware could be a little bit more robust; one could check the code whether the panic comes from a real voltage drop at the power supply or “just” from the temperature dropping more because of lack of more power than the control algorithm allows, before it decides this to be worse condition.
Some more data for those that can use it: I just printed a very large print, which covered almost the entire bed, and the print succeeded and the graph didn’t show any significant deviation of the bed temperature (more or less ±1). Then I printed a TINY little piece (case for an esp32 c3 supermini) and the temp dropped by more than 10C and caused the machine to panic.
So I think it’s a combination of the bed not being properly insulated AND not enough power from the PSU to recover.
Last update here, I guess: Snapmaker has determined that it is indeed the fans on the Dual-Extruder cooling the bed down and apparently the sensor for the bed is right in the middle, so they recommend “just don’t do that” as the “solution”, i.e. move pieces off to the side somewhere so the fan doesn’t blow into the center of the bed. I use the term “solution” here in its broadest possible application.
Note that somewhere along the way I swapped in a 650W power-supply and it didn’t make one bit of difference (I guess that makes sense: the bed is on the other side of the controller, and the controller would need to be able to handle the load. If I hooked up an external power-supply to the ONLY the bed, as I’ve seen some people with more electrical engineering expertise than me do, perhaps the bed could stay at temp better. Alas.
I still have an insulation mat I could cut up and insulate the bed from underneath, but I have a sneaking suspicion that won’t do shit, so…
I tried it on a J1 machine before. After adding an insulation pad at the bottom, the heating speed and heat retention level both improved significantly, which is why I suggested you give it a try.
Yea, and I have a pad I’ve been meaning to cut up and throw in. But I haven’t yet because