I wanted a clean solution for the runout sensor for my flsun q5 in connection with the bmg extruder and my dry box mount so I created one.

After inserting the threaded inserts and mounting the sensor, it has to be connected to the mainboard. 

A bowden tube is inserted into the lower hole, which goes into the extruder (the bmg extruder is mounted the right way up but upside down).

Please see the following instructions for setting up the runout sensor.

For the original firmware there is this video from Flsun:

https://www.youtube.com/watch?v=Fj-g24rI5Ts

For Klipper please follow the Klipper Documentary:

https://www.klipper3d.org/Config_Reference.html?h=filament

The following parts are needed:

- 2x M3 threaded inserts (ruthex style)
- 2x M4 threaded inserts (ruthex or short/cheap style = 4x4 mm)

- 2x M3x20 mm screw

- 2x M4x10 screw

- 1x M6 bowden tube coupling

- 1x filament runout sensor (links at the end)

I have uploaded two versions because I still had cheap m3 inserts and they are not exposed to much stress at this point. Nevertheless I have created a second version in case you only have ruthex style available.

If you would like a version for nuts, please write this in the comments.

Printing Notes:

Resolution:   0.2
Filling:   30 %
Walls:   3
Material:   PLA
Supports:   yes, only on bed and only under upper platform (as in the picture); Tree Support recommended

XY-Hole-Compensation:   0.1-0.2 mm recommended for better tolerances

Links:

AliExpress:

https://de.aliexpress.com/item/32884936454.html?spm=a2g0o.order_list.order_list_main.4.1ace5c5fKGwPl5&gatewayAdapt=glo2deu

Amazon:

https://www.amazon.de/KIMISS-Anycubic-3D-Drucker-Erkennungs-Detection/dp/B0BZ9NLWS1/ref=sr_1_2?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dib=eyJ2IjoiMSJ9.o9dFmEkat9EzygHPRnQChgCw-FBI7VPd-c1mkig_DHFOAtVkKG5Xg10aMq5ZIkJURDHFgoGFGHQ2raY-TcXZ2AziuYq4SIke5bWqMEw9ddZjMsFJPZG2wePREEMllqwgVP9FLtwIGH8UqYpneADEFTnVk4sQKSGgbBHHjDO3o1j2SubifW9MLRDtFdSztZDchIZhXPrhUl85-uVKMZEBQlSJ5UCWhtu_pJLsMhd0f_Fy7DnQ6Vwo_95z1j30Q9BdvikLSBtmRtqvgHwyBHlOLX1Hc80XsfWeZIB8cId6d8U.9JqrfcQ5JQFpwQUg3v4cOFdG90cpHwzMHEe9IzOQYzM&dib_tag=se&keywords=runout+sensor+filament&qid=1708695837&sr=8-2