Extruder - Greg Wade Geared extruder with J-head Hotend 0.35mm

From the Prusa I3 orginal documentation, I downloaded the STL file and assembled the extruder. Assembled as they taught and mounted it on. The only problem is I used J head. I was not sure whether J head can be mounted onto it.
Let's talk about  the gear head. It works well. For so long, the gear did not fail at all. still hard and steady. And I use PLA to print it.

To confess, the PLA printout from Cube 3D sucks. I am not sure how long it will last. but I know, as long as I get it to work, I will duplicate all the printed parts again....

THIS IS AWEFUL

YUCKS.....

But In the end, I managed to get it working .....