KCM issue with filament swap

[Le_zOU]

I noticed the following on my ender3 V3 plus (1.2.3.63) with the KCM kit
Orca 2.3.0

SOMETIMES
when a filament change occurs, the following happens;
current filament cut
current filament retract
E0 retract
E1 retract
E2 retract
E3 retract (even though E3 filament isn’t used in the print)

then error message : (see photo attached)
Filament retraction error.
This may be caused by a
clog or broken filament. Please check the 8-in-1 position and resolve the issue before continuing.

This is strange as loading hasn’t happened when the error message occur, it happens after unloading and before loading the next filament
I have to guess which filament is the next, manually push it through the extruder into the 8in1 funnel and resume, and keep pushing it until the head extruder catches it

Normal filament change is
current filament cut
current filament retract
next filament extrude
purge in tower (as per orca flusing volumes)
continue print

I’ve sent an email to co-print support, but I thought I’d asked here.

Should I completely unload E3 if I don’t use it in the print ? Is there a filament sensor inside the extruder ?

[Le_zOU]

Fixed
Filament sensor on funnel doesn’t get back in place
Solution;
remove the small printed box from the funnel
carefully remove the PCB,
remove the spring and metal plate
enlarge/smooth the hole where the spring sits
re assemble
test that the spring works as expected
re assemble on printer

[Le_zOU]

FilamentSensorBase.stl_1747034984747_u107d10.stl (216.1 KB)
FilamentSensorCover.stl_1747034992514_gjggu.stl (276.6 KB)

STL’s for the filament sensor, I plan to print them in 0.12 layer height, 60 mm/s to ensure proper accuracy

[Le_zOU]

27mn later (yes all my self printed improvement parts are orange, this is the way)

and added a glued bit of clear filament to improve LED visibility after enlarging the hole to 2mm