I have a low grade single screw filament extruder which has a 16mm dia and 210mm long barrel. Over the time, the barrel walls have become oblong (not perfectly cylindrical). I wish to replace the barrel on the extruder and was wondering what pressure would be generated inside the barrel so as to cause the problem. Would appreciate any help to get an idea on the pressure values so as to choose the correct barrel for the extruder.
