The filament is extremely difficult to insert. But more importantly it can not be withdrawn ! After the filament has been melted in the E3D-V6 hotend, it is to thick to go back through the lever arm ??? The tension screw can only be adjusted to max ~50%, and then the thumbwheel can not be turned by hand. And the tension has to be reset to zero, before you can change filament. Have I received the old faulty one I have read about ?