OctoPrint Pause/Resume  

OctoPrint Pause/Resume

Hi, I'm trying to add a filament runout sensor to my old Prusa i3 MK2 (fw 3.2.3, RAMBo13a) using OctoPrint where to connect the sensor. Before to buy the sensor and print needed components I have set gcode script in OctoPrint to verify that Pause and Resume print can work in the right way.

First attempt: using simple commands M601 and M602 ( https://blog.prusa3d.com/prusa-autumn-news-summary-2023-new-firmware-prusaslicer-mk3-5-info-and-more_86935/ ). They failed.

Second attempt: customize "After print job is paused" and "Before print job is resumed" scripts (see them below). I want to cool down the head as I am not always near the printer and I can see that the filament ends after some hours. It seems to work well: the head goes up and move to x=0, y=0 position and cool down. I can swap/insert the new filament, but after resume I have problem with extrusion: the filament does not come out. Positioning and temperatures are restored as before the pause.

Does anyone have any suggestions?

I have seen this thread: https://forum.prusa3d.com/forum/original-prusa-i3-mk2-s-others-archive/anyone-tried-the-new-pause-print-gcode-m601-m602/ , but it does not resolve my problems.

; ==================================
;  --- afterPrintPaused script ---
; ==================================
; (optional) disable stepper inactivity timeout - uncomment if you printer disables steppers during pause and supports this command
M18 S0

{% if pause_position.x is not none %}
; relative XYZ
G91
; relative E (extruder)
M83

; retract filament, move Z slightly upwards (5mm)
G1 Z+5 E-5 F4500

; absolute XYZ
G90

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

; restore filament extrusion
G1 E5 F4500

; absolute E (extruder)
M82

;disable all heaters
{% snippet 'disable_hotends' %}
; Does not turn off bed
; {% snippet 'disable_bed' %}
;disable fan
M106 S0

; beeps to notify the event
M300 S440 P200
M300 S660 P250
M300 S880 P300
; Set LCD display message
M117 Print Paused

; ==================================
; --- beforePrintResumed script ---
; ==================================
; beeps to notify the event
M300 S880 P300
M300 S660 P250
M300 S440 P200

{% if pause_position.x is not none %}

; =============================================================
; restore temperatures (to do before extrusion)
{% for tool in range(printer_profile.extruder.count) %}
    {% if pause_temperature[tool] and pause_temperature[tool]['target'] is not none %}
        {% if tool == 0 and printer_profile.extruder.count == 1 %}
            M109 T{{ tool }} S{{ pause_temperature[tool]['target'] }}
        {% else %}
            M109 S{{ pause_temperature[tool]['target'] }}
        {% endif %}
    {% else %}
        {% if tool == 0 and printer_profile.extruder.count == 1 %}
            M104 T{{ tool }} S0
        {% else %}
            M104 S0
        {% endif %}
    {% endif %}
{% endfor %}

{% if printer_profile.heatedBed %}
    {% if pause_temperature['b'] and pause_temperature['b']['target'] is not none %}
        M190 S{{ pause_temperature['b']['target'] }}
    {% else %}
        M140 S0
    {% endif %}
{% endif %}
; =============================================================

; relative XYZ
G91
; relative E (extruder)
M83

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

; absolute E
M82
; absolute XYZ
G90

; restore 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 %}

; restore fanspeed
{% if pause_fanspeed is not none %}M106 S{{ pause_fanspeed }}{% endif %}
{% endif %}

; Set LCD display message
M117 Print resumed