Possibly the 1.3 wall (aka shell) thickness could be the problem. You should set this to 1.2. This should always be an integral multiple of your nozzle diameter. So what Cura is probably doing is doing the 2 inner wall passes at .4mm each and then a .5mm outer pass which means it isn't touching the inner walls very well and is overextruding by 25% (.5/.4) to make up the full .5mm with a .4mm nozzle. This causes drooping. The "good" side probably got a little more cooling - or perhaps the fan air didn't push down on the filament strings as hard?
I could be wrong about this but this might explain it all.
Also are you sure this is gray PLA from UM? It looks very blue in the pictures :smile:
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illuminarti 18
Is your fan actually working during the print - and are you sure that it's blowing onto the print, and not sucking air off it?
Also, does it really seem to be slowing down so as to take 7s per layer?
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