Extruder direct drive Nema 17 1.75 with Jhead adaptation (for prusa?)

Direct drive 1.75mm filament extruder which work fine for prusa.
It use the standard 50mm M4 holes, and Jhead adaptation.
And is specially designed for 1.75 jhead Nozzles.

[NOTE] V0.6 is the last version

Caution! This is a prototype, it's not sure it work fine, I still need to test it for some time before saying it's perfectly working ;)