Extruder retracts the filament out of hotend

unknown28

I have been printing for couple of days now and there was too much filament stripping. So after doing all the usual steps, I decreased the feedrate to crazy low speeds (0.1). When I started printing with those speeds, the extruder will retract the filament so much that it will come out of cold end. It does it every time it has to retract while printing. I have tried re uploading the firmware, restoring all the settings, using different slicers (sli3cr and curaengine), But the problem won't go away

Retraction length is 2mm and speed is 25. Current Feed rate is 1mm/s

Repetier

Your problem is a missing

G92 E0

at the end of print and start of print. What happens is that your last print stops e.g. with E position 554 and when first e move is E1 it would retract 553 instead of extrude 1 mm. G92 E0 resets extrusion counter to 0.

unknown28

I checked that before. All the codes had that at the beginning and the end

unknown28

It does that everytime it has to retract

Repetier

That was the typical reason for the pattern. But without knowing what you are sending and printer state I can not say more. Please provide minimal gcode example causing the error.

unknown28

This is the g code

M104 S210 ; set temperature

G28 ; home all axes

G1 Z5 F5000 ; lift nozzle

M109 S210 ; wait for temperature to be reached

G21 ; set units to millimeters

G90 ; use absolute coordinates

M82 ; use absolute distances for extrusion

G92 E0

<div>G1 Z0.350 F6000.000

G1 E-2.00000 F1500.00000

G92 E0

</div>

And this the end

G1 E331.46172 F1500.00000

G92 E0

M107

M104 S0 ; turn off temperature

G28 X0 ; home X axis

M84 ; disable motors

unknown28

This is the g code

M104 S210 ; set temperature

G28 ; home all axes

G1 Z5 F5000 ; lift nozzle

M109 S210 ; wait for temperature to be reached

G21 ; set units to millimeters

G90 ; use absolute coordinates

M82 ; use absolute distances for extrusion

G92 E0

<div>G1 Z0.350 F6000.000

G1 E-2.00000 F1500.00000

G92 E0

</div>

And this the end

G1 E331.46172 F1500.00000

G92 E0

M107

M104 S0 ; turn off temperature

G28 X0 ; home X axis

M84 ; disable motors

MartinH

Can i ask

What type of extruder do you have (geared or direct drive)

What steps/mm is it set too

What feed rate is it set too

unknown28

Direct drive

829 steps per mm (calibrated)

1mm/s (filament was grinding too much despite nozzle being quite clean)

MartinH

829 seems very high for a direct drive.

I have a mk direct drive extruder and that uses 120 steps per mm

Repetier

Seems I missed the retract part that causes this. So check in slicer settings how much you retract. For direct drive 1-2mm should be enough.

Also check as MartinH said if steps are calibrated right. 100mm extrusion must such in 100mm filament!