Spur Gear Differential

I saw a Torsen differential recently and thought it was an interesting concept. Something about the symmetry appealed to me. Anyway, I was thinking about how it could be improved upon for the purposes of 3D printability.

Firstly, we can do away with the right angled gears so all axes can be parallel. This orientation will lend itself to print-in-place methods. Obtuse is probably too strong a word, but I'm not buying the worm/wheel explanation. With a 45 degree helix angle, it's ambiguous which is which. The reason it's harder to backdrive is due to the size difference and we have size differential at home.

Herringbone gears, because why not? Eliminate axial loads, make it smoother. Shouldn't even need bearings for the planet gears as the normal operation is for these to lock up. Maybe I misunderstand. Helical gears start behaving a lot like worm gears when the tooth count is low and the angle is steep enough. Perhaps it is precisely the nature of the axial loading that makes them