Hi @RoyMessin ,

A link isn't provided in the docs because every printer can use a different sensor. A good universal sensor is the Filatector.

Hi @henriquetironi ,

The filament sensor can be plugged into any board Klipper has access to, including your printer board and the board running your 3MS.

i put a endstop right after the Y

That would be classified as a shared gate sensor, so you would configure it like:

[mmu_sensors]
# If it's on your printer board
gate_switch_pin: ^some_pin
# If it's on your 3MS board
gate_switch_pin: ^mmu:some_pin

thanks! i'm installing all the hardware first, after this i'll start with the software, i'ts kind a simply but i'm no a expert with this things, my printer is a sapphire plus with robin nano v3 and a pi3 and now a creality board for the 3ms, i have here 3 BMG extruder that i'm will use now