The entire motor is easily milled on a 3-axis CNC provided you have the correct steel. Also the windings are very easily done by hand, unlike the radial flux where it’s a real pain to wind the motor. Last, but not the least, the magnet rotor can be double-sided, on both sides of the winding stator, which increases the efficiency and provides a symmetrical force. I saw somewhere a 3-d printed axial motor where the winding cores are only made of soft steel, and inserted into holes of two 3d-printed disks, and the magnets were glued outside also on two disks. Very easy to manufacture, just glue the thing together. You can wind the individual stator solenoids separately outside on a jig and press them into the 3d-printed stator disk.
Edit: You need to make the stator cores from either laminated or wire steel, else the Foucault currents will heat up the core and melt the plastic.