After the successfull simulations I decided to build another prototype. Here the PCB to mount the ESP32S and the 3x QMC5883L:

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And the 3D printed Knob with the magnets:
Building all together:

And it seams to work in general:

Findings & next step:

• Sometimes signals seam to jump, maybe a saturation effect ?
• Implement the tranfromation matrix to seperate the 6 axes
• Mount to a metal block and check if the stiffness of the feathers is sufficient (or too heigh)