Heated Chamber PWM fan Help
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@mrehorstdmd Thanks for the confirmation. I have a feeling the banding is maybe caused by the blower being too powerful and blasting hot air all over the print, really fast. So I'm going to experiment with leaving the fan under the duet's control separately and leave it on a really low speed so it's a gentle breeze. Maybe the temp swing won't be enough to play with the prints.
I've observed this on both ABS and ASA filaments.
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@dc42 Thanks for the information. Even though the heating element is on a different circuit, it seems that it can still have an effect due to the shared neutral.
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@darkstarone It doesn't fluctuate at all, the temps are perfectly stable (unless I open the door of course). It's a very sluggish system with a lot of heat capacity, so you don't notice the heater coming on at all.
I do notice the same effect with the oven light that's installed in the build chamber (which acts as its own 25W heater btw), which flickers when the duet kicks on the heater element. It's a visible flicker because I'm running the heater with 10 Hz PWM (SSR-compatible).
