I received a new Smart Extruder+ and have had nothing but problems out of it. I have sent 2 different prints to the makerbot since installing the Extruder+ and both times the filament jammed inside the extruder after only an hour or two. It's like filament debris builds up inside the extruder and after so long, it completely clogs up. Then it takes several unload/load filament attempts to clear the jam. I hope this is an isolated incident and not a design flaw with the new Extruder+. I have MakerCare and have been in contact with support; I should have 2 more Extruder+ on the way to test out.