Thanks for the explanation. I checked the setscrew and its good and I have not witnessed the micro-blower ever ‘not’ spinning but I am suspecting that it is indeed not doing its job.
I’ve now witnessed the problem occurring first hand during a print: The hobbed bolt is turning, the tensioner is correctly set per Lulzbot and community recommendations, yet the filament is not feeding. At this time during the print the micro-blower fan was turning. During this time I un-latched the tensioner and found it took a little bit of manual force on the filament to get it to start flowing again at which point a bunch of PLA spuged out of the hot-end.
This is ‘heat-creep’ right? I suspect that the PLA is either expanding or getting tacky above the chamber and sticking to the walls.
What are the chances this has something to do with my PLA? I’ve tried several spools of PLA that I’ve printed just fine with in the past but during the course of diagnosing this issue (a couple of weeks) the spools have been out on the bench. Could this be a moisture absorption issue if the PLA has only been out a couple of weeks?
Has anyone seen a failure mode of the micro-blower were its turning but perhaps not at proper rates?
I find that the micro-blower is not available for purchase (perhaps out of stock?). Is there a replacement that anyone recommends?