Filament sensor for Creality CR-10 using Raspberry Pi Octoprint

Filament sensor holder for Creality CR-10 for the type of filament sensor shown.
Requires 2x M3 x 12mm screws + nuts

Update: 2 new STL files:

1. For 3mm wide brass inserts
2. For 4mm wide PTFE (bowden) tube inserts

Raspberry pi connection

Connect to Raspberry Pi GPIO pins.

https://www.element14.com/community/servlet/JiveServlet/previewBody/73950-102-11-339300/pi3_gpio.png

Positive to pin 1
Sensor out to pin 7
Ground to pin 9

Octoprint setup

Install plug-in "Filament Sensor Reloaded"
Set up the plug-in as per the attached image.

In Octoprint Settings > Gcode settings, use the following for
"After print job is paused"

{% if pause_position.x is not none %}
; relative XYZE
G91
M83

; retract filament, move Z slightly upwards
G1 E-10 F6750
G1 Z+5

; absolute XYZE
M82
G90

; move to a safe rest position, adjust as necessary
G1 X0 Y0
M18 S21600
{% endif %}

Use the following for "Before print job is resumed"

{% if pause_position.x is not none %}
; relative extruder
M83

; prime nozzle
G1 E-5 F4500
G1 E5 F4500
G1 E10 F4500

; absolute E
M82

; absolute XYZ
G90

; reset E
G92 E{{ pause_position.e }}

; move back to pause position XYZ
G1 X{{ pause_position.x }} Y{{ pause_position.y }} Z{{ pause_position.z }} F4500

; reset to feed rate before pause if available
{% if pause_position.f is not none %}G1 F{{ pause_position.f }}{% endif %}
{% endif %}