Solution for the MMU2 cannot be homing
After testing we found two problems that will cause MMU2 to not be homing:
The motor（Selector motor） sold by FYSETC is different from the original one. Their current and torque are different.
You need to make the following changes to the code:
In the config.h file, change 6 to 2:
#define TMC2130_SG_THR_1 2//6
The wires of some F.I.N.D.A sensor sold by FYETC are incorrect. Show as the pic：
After changing according to the above figure, connect the power supply. when there is no filament, the top of the switch has a red light; when there is a filament, the red light is off.