Bonsoir Pilou:
agree with Michael...you can't expect fillet engine do something in a tight wrinkled area like that
but you can refine this object using sweep like this way
you can see after sweeping you have anymore wrinkles in that sharp area
i attached file,check inside the browser i marked splines i used
last orange one is final result.
your original shape without wrinkles,filleted using blend G2,mataining enough sharpness corner in front area
hope it helps: Mauro :)
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