Squeak is reduced, but still present at times with PLA. No squeak with ABS. In the previous thread, did you come to a conclusion as to the cause of the squeaking?

Recently experienced 2 more extruder jams with a particular spool of brown PLA. Tightening the guidler and bumping the hot end temp seems to have solved it for now, but I have not done any > 1 hour prints since I made the changes. I am beginning to suspect that this spool of filament could be a big part of the jamming problem.

Jim