Ive read a couple of times about users not being able to use the complete reel of filament, usually some problems occur at the end of the reel (last 50-100m).
That happened to me today. My reel is 3 months old, its been out in the open all the time, and Ive come to my last 50m (or even less). One part of the filament sticks to the glass plate, other one doesnt (the plate is clean), and also layers do not stick one to each other and get warped and distorted as more layers are created.
I tried printing some old parts, just to make clear that I didnt mess something up with exported g-code settings, but old parts were also badly printed.
So I am ditching this last fewer than 50m and starting a new fresh reel