Retraction / reverse extrusion not working

pulsar256

<font face="Arial, Verdana">Issue: </font>

Retraction not working (slicer driven or FEATURE_RETRACT / AUTORETRACT driven)

<font face="Arial, Verdana">Environment:</font>

Delta / Mini Kossel

non-geared extruder (85 Steps / mm)

<font face="Arial, Verdana">Affects: </font>

Official 0.92.8

Master / 1d627496ebdeb55f7c3b67c38908f77644ba5661

<font face="Arial, Verdana">Description:</font>

<font face="Arial, Verdana">Printing a g-code with retraction generated by the slicer (tested with MatterSlicer, Cura) will not result in extruder retraction. The extrusion will just briefly stop. The slicers were verified to produce valid gcode by testing them on the same printer running the Marlin firmware which showed no similar issues. </font>

<font face="Arial, Verdana">Some of the permutations tested were:</font>

FEATURE_RETRACT = 1, AUTORETRACT_ENABLED = 1, CURA (embedded) with retraction disabled, Marlin g-code style

FEATURE_RETRACT = 1, AUTORETRACT_ENABLED = 0, CURA (embedded) with retraction enabled, Marlin g-code style

FEATURE_RETRACT = 1, AUTORETRACT_ENABLED = 0, CURA (embedded) with retraction enabled, Ultimaker g-code style

FEATURE_RETRACT = 0, AUTORETRACT_ENABLED = 0, MatterSlicer with retraction enabled

<font face="Arial, Verdana">The autoretract feature was checked to be enabled or disabled via via "M209 S0" (off) and "M209 S1" (on). None of the Combinations made the extruder go backwards. </font>
Regardless of the mode, manual extrusion via Repetier-Host was only possible once. M83 had no effect on that.

<font face="Arial, Verdana">Config & EEPROM Settings</font>

https://drive.google.com/file/d/0B2xkcO8M801EYTlmWXM3MW00cWM/view?usp=sharing</span><br/></div>

Repetier

You should not use autoretract in firmware. This is only a last resort solution.

For the others I'd need to see the generated gcode for a retraction that does not work. Maybe the motor just stalls from acceleration/start speed too high?

pulsar256

As you said, I was using the autoretract option as the last option. Too high acceleration speed is rather unlikely (using pretty much the defaults here), but I can do some more tests this evening and provide you with the gcode examples.

pulsar256

<font face="Arial, Verdana">I did run another test today and made a short (_4min) video explaining the issue during a test-print: https://youtu.be/IfuW6YeWcUg</span></font><div style="font-family: Arial, Verdana; font-size: 10pt; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal;">
</div><div style="font-family: Arial, Verdana; font-size: 10pt; font-style: normal; font-variant: normal; line-height: normal;">Test-Files (stl, scad, g-code) and settings (matter-slicer settings) I have been using: https://drive.google.com/open?id=0B2xkcO8M801EYTlmWXM3MW00cWM</span></div><div style="font-family: Arial, Verdana; font-size: 10pt; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal;">
</div><div style="font-family: Arial, Verdana; font-size: 10pt; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal;">Whenever retraction should occur, extrusion just stops and there is not a slightest indication of the extruder moving backwards. </div><div style="font-family: Arial, Verdana; font-size: 10pt; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal;">
</div><div style="font-family: Arial, Verdana; font-size: 10pt; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal;">There is also a related Issue on Github: <font face="Arial, Verdana" style="font-size: 12px; line-height: 1.7em;">https://github.com/repetier/Repetier-Firmware/issues/455 - a</font> bit "short", but pretty much explains what I could observe on my end. </div><div style="font-family: Arial, Verdana; font-size: 10pt; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal;">
</div><div style="font-family: Arial, Verdana; font-size: 10pt; font-style: normal; font-variant: normal; font-weight: normal; line-height: normal;">G-Code from the printed File looks OK to me :</div><pre>; TYPE:WALL-OUTER (...) G1 X6.2 Y1.8 E878.05756 (...) ; TYPE:FILL (...) G1 F2400 E872.20424 G1 Z9.3 G0 F6000 X6.2 Y9.8 G0 X6.6 Y9.4</pre><div><div>Please let me know if I can do anything else to help.
</div></div><div>
</div>

pulsar256

Link to the test-files above was wrong: https://drive.google.com/file/d/0B2xkcO8M801EVzU5NEFtZ1VJM28/view?usp=sharing

Repetier

I can not see any retractions in your gcode. Look here for example

G1 F1260 X0.657 Y-0.657 E675.04034

6943G0 F6000 X-0.657 Y-0.657

6944G1 F1260 X0.659 Y0.659 E675.10225

6945G1 F2400 E669.10225

6946G1 Z5.7

6947G0 F6000 X-9.798 Y1.8

6948G0 X-9.398 Y1.4

6949; TYPE:WALL-INNER

6950G1 Z5.5

6951G1 F2400 E675.10225

6952G1 F840 X-9.398 Y-1.398 E675.19527

6953G1 X-6.598 Y-1.398 E675.2884

6954G1 X-6.598 Y1.4 E675.38146

You see the z hop where you expect retraction but E value only increases, no retraction present.

Retraction is after all a simple extruder move. Just send it manually from host and you should see the extruder move back and forth.

pulsar256

Thank you for looking into it. I am a bit confused now.

I have grabbed the gcode, extracted the extruder-movements and dumped it into an Excel-Sheet. I see a lot of -6 retractions (highlighted in red, second column "current-extruder - previous extruder" < 0 ? red : white ):

grep "G[01].E." pins.gcode | sed "s/G1.* E(.*)/\1/gi" > extruder.txt

https://docs.google.com/spreadsheets/d/1egM2PK1vnqPfE72RoHVYbVqsRcbNLSgf5ghl7edaUMA/edit?usp=sharing</div><div><br/></div><div>What am I missing?

Repetier

Say me in which line it is and I have a look. I have not used any analysing and expected to see normal retracts everywhere you hop. I have to time to search big gcodes for some occurences. The one I found by hand were all without.

pulsar256

For example right after printing skirt there is -6/+6 extrusion.

Offset: LINE 36

G0 F6000 X-11.797 Y11.8

; TYPE:WALL-OUTER

G1 Z0.3

G1 F2400 E14.68628

let me know if I should collect more examples. Just wondering what a "normal" retraction / extrusion should look like? I am a bit new to g-code, so it is totally possible I am missing some important details here.

</font>

pulsar256

Line 7031, with Z-Hop:

G1 F1260 X0.659 Y-7.825 E678.68797

G1 F2400 E672.68797

G1 Z5.7

G0 F6000 X6.2 Y-6.198

G0 X6.6 Y-6.598

; TYPE:WALL-INNER

G1 Z5.5

G1 F2400 E678.68797

pulsar256

Duplicate: http://forum.repetier.com/discussion/1736/extruder-motor-issue-on-delta

Repetier

There was a bug with retraction on AVR boards. It is now fixed in latest release.

AleXileD

Still having this problem on my ramps 1.4 board with FW 9.28..
uploaded with arduino IDE 1.6.5.. will be trying with IDE 1.6.7 tommorow

AleXileD

Can confirm retraction works again when uploading the newest firmware with the Arduino 1.6.7 IDE!

In the manual control I still can only press extrude once .. then I have to press retract before I can extrude again. does anyone know why? :)

Thanks!!!