How I fixed spurious Y-axis crashes
It seems some of us printing higher-temp filaments such as ASA, PC etc have been experiencing spurious Y-axis crashes when there were none. It seems to be correlated to heat, so I decided to insulate the heated bed and LMU8 bearings with aerogel. I bought some Rova Flex 25x25cm and they were almost a perfect fit for the heated bed. Just needed a little trimming with a sharp pair of scissors.
For the bearings I cut the aerogel into 25x55mm strips and wrapped them.
They were a tight fit back into the brackets, and some of it broke down, but so far it seems to work. No more phantom Y-axis crashes. Hope this tip might prove useful to others.
Just on Heatbed
i'm going to try it just on my heatbed because i don't have enough aerogel on hand for the bearings. Hopefully it will be enough to fix it.