Illustrated below is the difference between the Direct Drive and the Bowden Drive Axioms.
-Bowden machines have the extruder assembly on the back of the printer with a tube guiding the filament to the hotend on top of the machine.
-Direct Drive machines have the extruder assembly integrated on top of the hotend.
(Above) Axiom Single - Bowden Hotend
(Above) Axiom Single - Bowden Extruder
(Above) Axiom Single - Direct Drive Hotend & Extruder