The bottom flat surface of the nozzle flattens down the layer of plastic, for each nozzle size this has been customised. On the smaller nozzles, a small tip gives high precision. Whereas on the larger nozzle, a large flat tip improves the finish when printing large layers.

All nozzles are now identifiable by the markings seen on the flats of the hex head. See the table below to identify each nozzle.