We just assembled our TAZ 5 yesterday and went through all the calibration/test print stuff, and our octopus was printing nicely. When it was almost complete, however, the extruder head was still moving, but no filament (ABS) was being extruded. I stopped the print and found that the filament was stuck and that the steel/aluminum gear that feeds the filament to the extruder head was grinding the filament (looks like it has a bite taken out of it) instead of feeding it.
I have tried to the remove the filament but it is stuck fast. I have tried removing it while extruding and reversing, but to no avail. The extruder head still slowly oozes filament out when it is heated up (240deg), however, so I am not sure how to unclog/see what is causing the stuck filament.
Any help would be greatly appreciated in this discouraging time!