Dual Extruder simply does not work

[xchrisd]

[First Batch Shipped Out] FAQs of Dual Extrusion 3D Printing Module for Snapmaker 2.0

I have a dual print toolhead from the second batch. There was a improvement on the feedgear door mechanism but unfortunately it seems not to work. There is a rubber inserted which is not strong enough. The door stays close but i have grinding problems every print full of retraction. So, print the wedge (mine with +10% in z axis to tight fit)!