Good question! I probably could try drying this filament again, just for kicks…I did dry it not too long ago but it’s probably been long enough that it couldn’t hurt. But yes I’ve seen this issue with virtually every PLA filament I’ve used when the factors I mentioned are all true.
When this failure occurred, I was about 100 filament swaps in (it’s a multicolor print) so faint evidence of the nozzle purging/eject/reload/etc process in the midst of powerful fans is at least initially what I had attributed that to.
Well…fast by Ender/etc. standards lol but nowhere near pushing Ratrig performance envelopes here lol. Pretty much stock profile speed wise