Retraction on extruder switch doesn't work for me

rhklein

Hi,
I tried setting the length to 2mm in eeprom, but to no effect. 
I'm using slic3r and have firmware retraction enabled and minimum travel for retraction set to 0mm. (so always retract)
Retraction works for travel moves, but not when switching extruders on the same layer.
Here is a gcode example:

G1 X87.714 Y76.492 E0.59622

M163 S0 P1

M163 S1 P0

M163 S2 P0

M164 S0

T0

G1 X116.754 Y79.437 E2.95599

G1 X118.814 Y81.303 E3.16825

G1 X120.665 Y83.373 E3.38042

G1 X121.997 Y85.180 E3.55183

M163 S0 P0

M163 S1 P0

M163 S2 P1

M164 S1

T1

G1 X122.000 Y114.817 E5.95269

G1 X120.667 Y116.624 E6.12419

G1 X118.815 Y118.696 E6.33641


There is no retraction after swithing extruders with T0 or T1.
Any settings I forgot that could revent retraction?

Repetier

You seem to have a mixing extruder from the gcode. Here switching extruders is just selecting a different weight of mixing ration and no retraction will occur from firmware side on extruder switch as everything is mapped to extruder 0.

rhklein

Yes, I'm using a mixing extruder. Is there a way to force retraction before a color switch?
I thought switching virtual extruders from T0 to T1 would trigger an extruder switch?

Repetier

No, your slicer must include

- G10 S<1 = long retract, 0 = short retract = default> retracts filament according to stored setting

- G11 S<1 = long retract, 0 = short retract = default> = Undo retraction according to stored setting

to add retraction where wanted. Even with normal extruders there is no retract on extruder switch on it's own. Slicer always needs to tell that.

rhklein

Ah, thanks.
I didn't know that.
Slic3r only lets you turn on firmware retraction, but doesn't let you choose between short or long retract.
It does so for non firmware retraction, but doesn't matter much for my case.

As always, thank you for your fast response.