This is the main pinion gear translating movement from the worm gear to the dual drive gears. I threw in a little twist to better optimize surface contact which I am surprised to not see done more for similar projects.
Most of the extruder assembly is complete but top secret for now because it's essentially just two halves of a cube with all the necessary slots cut out. I will show it later when I am a little happier with it. Expect lots of 3D printed prototypes and testing before final production.