resume redundant extrusion

bugpwr

There seems to be additional extrusion when resuming a job, which is not part of what's done by resume.g. It happens at a very different speed (faster), right after the macro has done its thing.

My guesss is some kind of relative/absolute extrusion mixup when returning to the correct gcode position within the job - meaning, the redundant extrusion comes from what is written in the job file itself. Stems from rrf forum topic 416,832302,896231.

For reference, here's my pause/resume.g.

; pause.g
M83 ; relative extruder moves
G1 E-10 F3600 ; retract 10mm of filament
G91 ; relative positioning
G1 Z20 F360 ; lift Z
G1 Y-30 F6000

; resume.g
G1 R1 X0 Y0 F6000 ; move XY first to saved pos
G1 R1 X0 Y0 Z5 F6000 ; go to 5mm above position of the last print move

G1 R1 X0 Y0 Z0 F6000 ; go back to the last print move
M400 ; wait for moves to complete
M83 ; relative extruder moves
G1 E10 F300

Opening this here due to dc42's advice.

Phaedrux

Firmware version? Which Duet board?

bugpwr

@Phaedrux Duet2Wifi, FW 3.5.4 but also tried with 3.6.0 beta 1.

Phaedrux

@bugpwr said in resume redundant extrusion:

There seems to be additional extrusion when resuming a job

Can you show a photo of what you mean?

bugpwr

@Phaedrux I will make a video later as this huge printer is now printing, but let me try to describe the steps clearer:

start print
pause in the middle of the print. wait until paused. 10mm retract occurs as it should. print is now paused.
resume the print. unretract (extrude) of 10mm happens accordung to resume.g. This has no effect because it was retracted before.
printer now extrudes another 5 to 15 mm for no reason, very quickly, much quicker than the F rate specification of the respective command in resume.g
printing resumes with an ugly blob. this happens almost every single resume.

droftarts

@bugpwr Original thread is here: https://reprap.org/forum/read.php?416,832302

Please post your config.g, and the gcode (or a test gcode) that exhibits the problem. Are you pausing in the middle of a long move? Are you using absolute extrusion? Do you have segmentation enabled?

Please could you also test with RRF 3.6.0-beta.2, as this issue may already have been fixed. https://github.com/Duet3D/RepRapFirmware/releases/tag/3.6.0-beta.2

Ian

bugpwr

@droftarts hi, sorry it took so long and many thanks for help.

First, answering your questions:

same with beta2
no, the pause is not in the middle of a particularly long move. My feeling is that this happens at every pause.
I could not find any segmentation settings in OrcaSlicer (which I am using)
from what i see in gcode, the slicer is using relative extrusion
attaching the gcode of a cube 20x20x20 with 2 walls and some simple infil, that is used in the video
youtube link at youtu be: c0CzmD-DGdg?si=Dh9AtsguJKMDB1lt to see the phenomenon in action. an overextrusion is clearly heard at 00:26

Here goes config.g:

===================================================
; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"M1 Magrethea"

; Emergency stop at E6 - to be replaced with power cut
M950 J6 C"duex.e6stop"
M581 P6 T0 S1 R0

; Network
M552 S1 ; connect wifi to internally stored ssid
M586 P0 S1 ; enable HTTP
M586 P1 S1 ; FTP

; Drives
M569 P0 S1 ; X ; physical drive 0 goes forwards
M569 P1 S1 ; C
M569 P2 S1 ; this is the dual channel connected to right Z motors
M569 P3 S1
M569 P4 S0 ; E
M569 P5 S0 ;
M569 P6 S0 ;
M569 P7 S0 ; right Y
M569 P8 S1 ; left Y
M584 X0 Y7:8 Z2:5:6 E4 C1 P3 ; set drive mapping; P4=visible axes. right Z motors are on the dual channel driver. 5 is back left, 6 front left
M350 X16 Y16:16 Z16:16:16 E16 C16 I1 ; configure microstepping with interpolation
M92 X80.00 Y100:100 Z1600:1600:1600 E783 C80 ; these are the correct theoretical model. measured with orca calibration
M566 X300 Y300:300 Z10:10:10 E320.00 ;120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X10000.00 Y10000:10000 Z600:600:600 E1200.00 ; set maximum speeds (mm/min)
M201 X6000.00 Y4000:4000 Z100100 E450.00 ; set accelerations (mm/s^2)
M906 X1200 Y900:900 Z1800:900:900 E900 C80 I15 ; set motor currents (mA) and motor idle factor in %. My extruder is rated for 1A
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X652 Y430 Z690 S0 ; set axis maxima. z could be 701. X has about 1mm spare, to enlarge, relocate X probe.

; Endstops
M574 X2 S1 P"!xstop" ; x stop, sorry for using NO stop. better to reconfigure as NC
M574 Y2 S1 P"ystop+e1stop" ; configured as NC, which is a good thing to do

; Filament sensors
;M591 D0 P3 C"e0_stop" S1 ; drive 0, magnetic filament monitor, plug, enable
M591 D0 P1 C"!^e0stop" S1 ; microswitch sensor drive 0, active low, pin, enable

; Z-Probe
;M307 H3 A-1 C-1 D-1 ; H7 means E6 (Duex /Expansion). Disable heater so this pin can be used; probably not needed coz it says heater not found
; "You can no longer disable a heater using M307 A-1 C-1 D-1. To use the pin for something else, don't create a heater on that pin."
M950 S0 C"duex.pwm5" ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.i^H^H^H^Hn" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P20 X-31 Y1 Z1.12 ; set Z probe trigger value, offset and trigger height; lower Z means print higher. NOZZLE: 0.5 HF
M375 ; load height map

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 ; configure sensor 0 as thermistor on pin bedtemp. Tnnn (for thermistor sensors) Thermistor resistance at 25C, Steinhart-Hart thermistor model B coefficient
M950 H0 C"!exp.heater4" T0 ; Q0
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0

M308 S1 P"e1temp" Y"thermistor" T100000 B3950 ; configure sensor 1 as thermistor on pin e1temp
M950 H1 C"e1heat" T1 ; create nozzle heater output on e1heat and map it to sensor 1
M307 H1 R3.004 K0.380:0.000 D11.29 E1.35 S1.00 B0 V23.9
M570 H1 P20 T20 ; temperature excursion 20, time 20s - abit too long but the PID is annoying
M143 H1 S270 ; set temperature limit for heater 1 to 270C

; Fans
M950 F1 C"duex.fan4" Q10 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"duex.fan3" Q10
M106 P2 S0 L250 X255 B0.1 H-1 ; set fan 0 value. Thermostatic control is turned off

; Tools
M563 P1 D0 H1 F2 S"Right" ; define tool 1, extruder 0, heater 1, fan 2
G10 P1 X0 Y0 Z0 ; set tool 1 axis offsets
G10 P1 R0 S0 ; set initial tool 1 active and standby temperatures to 0C

M309 P1 S0.03 ; this is flow/heater power compensation

; Custom settings are not defined

; Miscellaneous
M575 P1 S1 B115200 ; enable support for PanelDue, UART at 115200 baud
M564 H0 ; H1 = forbid movement of axes that have not been homed, H0 = allow movement of axes that have not been homed
M302 P1 ; allow cold extrusion

G92 C0 ; nevermind this axis for now

T1 ; default tool is 1
======================================================end of config.g

Cube_PLA_6m41s.gcode