iCarbon def had some fitment issues, like it was already stated, the middle part was coming loose and a few people got cracks after a while.
IMO, its the design thats faulty, when made out of CF, the piece is too rigid to be able fit properly. If the same design was made using urethane, it would fit perfectly but in CF, it just doesnt work. Think this is why it took them so long to make the lip, I'm sure they ran into this issue
although Hamann is not on the list, I think this is the best route for them.
so I switch my vote from 3D to Hamann