We’ve had great success printing several rolls of Verbatim PLA with our Dual Extruder V2 on our Taz 5, at 205C with a 60C bed. Until now. Suddenly we are experiencing jams that can’t be effectively cleared even with cold pulls. We swapped in a new nozzle, it printed for a while, and then it also clogged.
On the most recent cold pull, there was a very distinct brown flaky film on the end of the plug we pulled out:
We also saw this film on other cold pulls, and inside of the hopelessly-clogged nozzle we pulled off (which is the one in the photo, if you look closely you can see the brown inside).
We then discovered that the roll we are printing with is a different lot number than all of the other ones we’ve had so much success with, so we are switching back to one of those and trying again. We’ll see how it goes. In the mean time, does anyone have any idea what that brown film might be? It will flake right off if you scrape it with an Exacto knife. It looks very much like rust, but I can’t imagine that’s what it is, I don’t know where that would come from. By the way, this roll had been vacuum sealed with desiccant until just a few days ago.