Hi, i just reworked the inner part of the K8200 extruder inner parts.
I tried to get better filament guide for flex filaments and a direct mount for E3D Hotends.
Have a look at it and leave me a note if you want…
great work.
will try it when i get my new hot end 
Update :
Version 2 now online.
I got it to print at 50mm/s