Trimmed edges holding axle ball bearings, this did the trick and allow rotor to freespin. So we have modified the design accordingly.

Further, the magnets where added and checked that loading does not impair spinning

Pic: most magnets added top stator liftedin this picture)

Further we added the small rotor extension wings that can be used to attach blades. Here the design needs to be modified so as to fasten these extensions more securely. Otherwise the 3 rotor laminates can be split appart by forces parallel to the axis of rotation .

(Pic of assembled rotor with magnets on both sides, ball bearings and extension wings)