Glad they got you fixed up. One thing you do have to be careful with is getting filament stuck in the plastic feed tub above the heat block when removing it to change spools. The only way to get that out is to tear down the extruder and remove it manually, which is easy to do but annoying to stop everything to do it. After having to do that a number of times, I finally figured out that it is best not to pull the warm filament back up the tube. Now when I need to change filament, I simply heat to extrusion temperature, snip off the old filament just above the intake, and gently insert new filament behind the old as I extrude about 30mm or so until the new filament feeds on it’s own. Then I purge the old filament (about 30-50mm) and the new filament is ready to print. Presto, no more jams in the plastic feed tube. Hope this helps someone out there with this issue.