CR-10 Direct Drive

I was trying to print a lot of things on my CR-10S with NinjaFlex and got tired of it binding in the long bowden tube. Even on a normal filament I occasionally got bad prints because the tube had pushed out of the extruder for some reason. The mechanics of the Creality extruder/bowden assembly seem like a pretty poor design to me.

So I started to design a direct drive system to move the extruder stepper above the hot end and limit my bowden tub to less than an inch. Though I have pretty mu