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MarlinFirmware / Marlin

Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
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[BUG] Extruder retracting before print #21641

Closed housam-s closed 2 years ago

housam-s commented 3 years ago

Did you test the latest bugfix-2.0.x code?

Yes, and the problem still exists.

Bug Description

Printer setup: Ender 3 pro with skr mini e3 and bltouch

Issue: has been there since day 1 basically when a print starts, right before the purge line starts the printer retracts heaaaaaps of filament, nothing prints on the purge line, then when the actual print starts it retracts again. Now to get around this, I’ve been feeding the filament back in and the print continues normally. This was happening before any upgrades too. I have posted my start gcode in the comments.

Troubleshooting:

start gcode

G92 E0 ; Reset Extruder G28 ; Home all axes ;G29; ABL G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed G1 X0.1 Y20 Z0.3 F5000.0 ; Move to start position G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line * This is where the issue occurs G1 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little G1 X0.4 Y20 Z0.3 F1500.0 E30 ; Draw the second line issue occurs again*

Bug Timeline

This started happening after upgrading to marlin 2.0

Expected behavior

Expect the extruder not to retract any filament after purge line.

Actual behavior

Extruder retracting before print

Steps to Reproduce

Print anything

Version of Marlin Firmware

2.0 bugfix

Printer model

Ender 3 pro

Electronics

Skr mini e3 v2.0 and bltouch

Add-ons

No response

Your Slicer

Cura

Host Software

OctoPrint

ellensp commented 3 years ago

Please attach your configuration files.

thisiskeithb commented 3 years ago

I suspect this has something to do with relative vs. absolute positioning for the extruder.

Try adding M83 before your G92 E0 line:

M83  ; Set extruder to relative mode
G92 E0 ; Reset Extruder
G28 ; Home all axes
;G29; ABL
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X0.1 Y20 Z0.3 F5000.0 ; Move to start position
G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
G1 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little
G1 X0.4 Y20 Z0.3 F1500.0 E30 ; Draw the second line
housam-s commented 3 years ago

Have attached my config files here.

Marlin.zip

housam-s commented 3 years ago

I suspect this has something to do with relative vs. absolute positioning for the extruder.

Try adding M83 before your G92 E0 line:

M83  ; Set extruder to relative mode
G92 E0 ; Reset Extruder
G28 ; Home all axes
;G29; ABL
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X0.1 Y20 Z0.3 F5000.0 ; Move to start position
G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
G1 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little
G1 X0.4 Y20 Z0.3 F1500.0 E30 ; Draw the second line

I will give this one a try and report back.

housam-s commented 3 years ago

I suspect this has something to do with relative vs. absolute positioning for the extruder.

Try adding M83 before your G92 E0 line:

M83  ; Set extruder to relative mode
G92 E0 ; Reset Extruder
G28 ; Home all axes
;G29; ABL
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X0.1 Y20 Z0.3 F5000.0 ; Move to start position
G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
G1 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little
G1 X0.4 Y20 Z0.3 F1500.0 E30 ; Draw the second line

Just tried the M83 command suggested, the issue was not present anymore, however the extruder is just infinitely extruding and not under proper control from the printer. It just kept turning

Eliminateur commented 3 years ago

I had this exact thing happen to me with several prints and spent and inordinate amount of time trying to fix it, i think i got it working, the issues is the extruder is in absolute mode, do this to your startup gcode, i've changed some of your G1 to G0 for good practice(it's good practice that non-extrusion movements are kept as G0), the zeroing should be after the bed leveling:

G90 ; absolute values(it sets ALL axes to absolute) G28 ; Home all axes ;G29; ABL G92 E0 ; Reset Extruder G0 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed G0 X0.1 Y20 Z0.3 F5000.0 ; Move to start position G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line * This is where the issue occurs --> this should extrude 15mm alright G0 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little G92 E0 ; Reset Extruder G1 X0.4 Y20 Z0.3 F1500.0 E15 ; Draw the second line issue occurs again* -->again extrude 15mm G92 E0 ; Reset Extruder

i'm assuming you're drawing a 200mm long line along Y twice to wipe, imho you don't need such a long wipe, and it also could be spaced more (my own wipe is just 45mm along the X axis with triple steps of extrusion).

I don't have the exact gcode i used at my printer at hand here, but i'll be able to check it later today

housam-s commented 3 years ago

I had this exact thing happen to me with several prints and spent and inordinate amount of time trying to fix it, i think i got it working, the issues is the extruder is in absolute mode, do this to your startup gcode, i've changed some of your G1 to G0 for good practice(it's good practice that non-extrusion movements are kept as G0), the zeroing should be after the bed leveling:

G90 ; absolute values(it sets ALL axes to absolute)

G28 ; Home all axes

;G29; ABL

G92 E0 ; Reset Extruder

G0 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

G0 X0.1 Y20 Z0.3 F5000.0 ; Move to start position

G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line * This is where the issue occurs --> this should extrude 15mm alright

G0 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little

G92 E0 ; Reset Extruder

G1 X0.4 Y20 Z0.3 F1500.0 E15 ; Draw the second line ** issue occurs again*** -->again extrude 15mm

G92 E0 ; Reset Extruder

i'm assuming you're drawing a 200mm long line along Y twice to wipe, imho you don't need such a long wipe, and it also could be spaced more (my own wipe is just 45mm along the X axis with triple steps of extrusion).

I don't have the exact gcode i used at my printer at hand here, but i'll be able to check it later today

Thank you so much. Will give this a try!

erikcramerjr commented 3 years ago

I had this exact thing happen to me with several prints and spent and inordinate amount of time trying to fix it, i think i got it working, the issues is the extruder is in absolute mode, do this to your startup gcode, i've changed some of your G1 to G0 for good practice(it's good practice that non-extrusion movements are kept as G0), the zeroing should be after the bed leveling: G90 ; absolute values(it sets ALL axes to absolute) G28 ; Home all axes ;G29; ABL G92 E0 ; Reset Extruder G0 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed G0 X0.1 Y20 Z0.3 F5000.0 ; Move to start position G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line * This is where the issue occurs --> this should extrude 15mm alright G0 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little G92 E0 ; Reset Extruder G1 X0.4 Y20 Z0.3 F1500.0 E15 ; Draw the second line issue occurs again* -->again extrude 15mm G92 E0 ; Reset Extruder i'm assuming you're drawing a 200mm long line along Y twice to wipe, imho you don't need such a long wipe, and it also could be spaced more (my own wipe is just 45mm along the X axis with triple steps of extrusion). I don't have the exact gcode i used at my printer at hand here, but i'll be able to check it later today

Thank you so much. Will give this a try!

Did this fix your issue I have something similar on my SKR Mini E3 board. but it does not happen every time. Only if I change filament right before a print.

Boia11 commented 3 years ago

I suspect this has something to do with relative vs. absolute positioning for the extruder. Try adding M83 before your G92 E0 line:

M83  ; Set extruder to relative mode
G92 E0 ; Reset Extruder
G28 ; Home all axes
;G29; ABL
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X0.1 Y20 Z0.3 F5000.0 ; Move to start position
G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
G1 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little
G1 X0.4 Y20 Z0.3 F1500.0 E30 ; Draw the second line

Just tried the M83 command suggested, the issue was not present anymore, however the extruder is just infinitely extruding and not under proper control from the printer. It just kept turning

Same problem with my Anet A8 with no firmware change (I use configuration file example). I use version 2.0.9.1. At starting print the extruder start to infinitely retract filament. This problem happened if I sent command directly to machine from octoprint terminal.

Command M83 work but for print I enable "relative extrusion" into machine setting of my slicer (I use IdeaMaker and Simplify3D)

danielenestrom commented 2 years ago

This is happening on my Ender 3 Max with 4.2.2 board and BL Touch. It retracts during purge line instead of extruding. It happens randomly and aborting the print and restarting the same gcode solves the issue most of the times, but as it is seemingly random, sometimes it has this behaviour several times in a row, before behaving correctly. I can see no pattern to it, but I will keep trying to see if I can reproduce the issue with more certainty.

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