BIGTREETECH SFS V2.0 Smart Filament Runout Sensor

[johncotten]

If you aren't familiar with this sensor, it not only detects filament runout but it also detects clogs and jamming.

I was an early adopter on v.03 primarily to update the crappy runout sensor with a smarter sensor. The Non Klipperscreen version V.03 has been working fantastic all this time. But I occasionally had a glitch where the "pause" command would only temporarily home then start printing 20 mm off the surface. This was not this mod problem but something in the 2.4.5 firmware I was running.
Today I decided to upgrade to the latest 2.7.8 and v.05 of this mod. Everything except wifi seems to work on the guppy screen version. There was a few changes I needed to do, and decided I would share for anyone wanting to update to this Runout Sensor.

In the macros.cfg you will need to change the variable_runout_sensor in _CLIENT_VARIABLE to
variable_runout_sensor : "filament_motion_sensor runout_sensor"

I also changed these because it was parking to change out filament in the front left which wasn't possible to do:
variable_custom_park_x : 105.0 ; custom x position; value must be within your defined min and max of X
variable_custom_park_y : 105.0 ; custom y position; value must be within your defined min and max of Y
variable_custom_park_dz : 30.0 ; custom dz value; the value in mm to lift the nozzle when move to park position

In the printer.base.cfg I changed:

Filament runout sensor

[filament_switch_sensor runout_sensor]
pause_on_runout: False
switch_pin: !PB14
event_delay: 1.0
runout_gcode:
_FILAMENT_RUNOUT_EVENT

to

[filament_motion_sensor runout_sensor]
pause_on_runout: False
switch_pin: !PB14
detection_length: 5.0
extruder: extruder
runout_gcode:
_FILAMENT_RUNOUT_EVENT
M117 Filament runout

The cable for the BTT is a 4 pin cable that is split. You have to rein the cable to match the below image. Red,Green,Back with the blue not connected to anything.