Filament runout detection by Dutchcolonial

Last crawled date: 3 years, 4 months ago

Finally got around to build something to deal with running out of filament when printing from Octoprint (not direct from SD card) on my Ender 3 Pro.
I created this bracket to use with the following switches:https://www.amazon.com/gp/product/B00MFRMFS6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I connected the two outer most connections to my raspberry pi as you can see in the pickture.
The housing for the pi is:https://www.amazon.com/gp/product/B081N3V6BH/ref=ppx_yo_dt_b_asin_image_o06_s01?ie=UTF8&psc=1
Connect it to physical pins of the pi (4B) as shown in the picture.
The wire guide STL is a nice to have if you want to guide the wire to the side of the frame.
I use the filament sensor reloaded plugin for Octoprint and have included a screenshot for the settings for the plugin.
You will also have to tell Octoprint what to do when a print is paused (for you to change filament):
{% if pause_position.x is not none %}
; relative XYZE
G91
M83
; Lower extruder temp
M104 180
; retract filament, move Z slightly upwards
G1 Z+5 E-5 F4500
; absolute XYZE
M82
G90
; move to a safe rest position
(use X0 and Y0 depending on your printer)
G1 X220 Y220
{% endif %}
And what to do when resuming a print:
{% if pause_position.x is not none %}
; relative extruder
M83
; prime nozzle
G1 E-5 F4500
G1 E5 F4500
G1 E5 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 %}
You configure these settings in the GCODE Scripts section of the Octoprint settings.
It all works like a charm as can be seen from the example picture where I switch from black to grey filament. Seamless.