Anet A6 bowden adapter for flexible filament (fixed and reworked)

**Also check mk7/bearing version here: https://www.thingiverse.com/thing:2846145**

**UPDATE!**
*2018-03-30:*
Previous version had some dimentions issues and little bearing with the groove had friction with the adapter wich as a result was making unnecessary load on E motor and even preventing filament to move.
As this design was a remix from stl-file, I tired from editing it and decided to redesign it from scratch by taking measurements from actual parts I had.
I made a bigger gap between