The vanishing cylinder bug trick.

 From:  DannyT (DANTAS)
2329.6 In reply to 2329.5 
Hi Anis,

Yeah that's right! I remember now, but your problem was the opposite, you had to rotate the seams 90° away from each other for the fillet to work, funny that.
Found it ! http://moi3d.com/forum/index.php?webtag=MOI&msg=2264.14

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~Danny~