It's a FF Creator Dual Head. Purchased about 3 years ago and it has nearly 4,000 hours on it. However, the entire dual print head (and all cables) were replaced about 6 months ago, so they should be good. The only thing I've done recently was to replace the main extruder belt, but that was a week ago and I've run dozens of prints through it since that time (but just to be sure, I checked the belt and it's not binding anyway. regardless, movement isn't the issue). I pulled the guide tube completely off to check if there's something wrong there. No change, the filament simply stops feeding as it reaches the left side and the extruder starts chattering again. Maybe I'll try to shoot a short video and upload to youtube so it can be seen exactly what's going on.