- There are STLs made for the Hex hot end. It runs with both.

- e3d Chimera is 18mm center to center on each throat. I think the Flex V2 is 27mm center to center.
So, it would not fit. The groove plate is made to lock a J-head hotend onto the extruder base. So, even
the mechanics aren't right. (Good luck with that one!!!)

- I'm NOT Mr J Clough though...
It IS a cool little extruder.