This is a remix of the bondtech base from STIG's M6 pneumatic fitting remix of the Cjwelcome posting of the original bondtech. (got it?)

The original has an annoying recessed area on the front which I wanted to eliminate. And more importantly, I wanted the front to be open to make the gearing visible.
This is just the "base" piece. See STIG's thing for the other parts.

BTW: Pardon the somewhat crappy print (it is even worse in person than the photo). It was printed with my existing broken extruder which it has since replaced.