dual extruder - distance pullup through material change

Hi all,
does anybody know how to change the distance between filament change in Sli3er or Marlin firmware, I dont know where to find it or how to configurate it.
I do not need when the wiping tower cycle starts to do my any extruder additional material pullback, now it is around 100mm, need 0.
Does anybody know how to do it ?

Edited 1 time(s). Last edit at 10/28/2017 09:31AM by Arnold.

Isn’t it part of your slicers tool change script?

Really dont know, this occured only when I turned on wiping tower. Even do not know where I can find scripts. Actually I tried cyclop and had to remove it, chimera seems to be better solution, but dont know what with oozing - blobing.

In slic3r you find these retraction values in the printer setting/extruder1/extruder2 submenue.

Hmm, it is not that. This what you think is normal retraction. I mean long unload retraction maybe for changing material, but I dont change it so need to switch it off. In cyclops do not need unload.

What do you have in slic3r -> printer settings -> custom g-code -> tool change g-code ?

Here is what is there:

Start:

M115 U3.0.12 ; tell printer latest fw version
; Start G-Code sequence START
T[initial_tool]
M104 S[first_layer_temperature] ; set extruder temp
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S[first_layer_temperature] ; wait for extruder temp
G21 ; set units to millimeters
G90 ; use absolute coordinates
M83 ; use relative distances for extrusion
G28 W
G80
G92 E0.0
M203 E100
M92 E140
G1 Z0.250 F7200.000
G1 X50.0 E80.0 F1000.0
G1 X160.0 E20.0 F1000.0
G1 Z0.200 F7200.000
G1 X220.0 E13 F1000.0
G1 X240.0 E0 F1000.0
G1 E-4 F1000.0
G92 E0.0

End:

M107 ; fan off
M104 S0 ; turn off temperature
M140 S0 ; turn off heatbed
G28 X0 ; home X axis
M84 ; disable motors


Before layer ch....

;BEFORE_LAYER_CHANGE
;[layer_z]

After layer ch...

;AFTER_LAYER_CHANGE
;[layer_z]


Tool change

empty

I've only played around with this type of system (I'm presuming a 2 in 1 out y splitter type thing) you either get your firmware to do it RRF via duet can handle it see here [www.duet3d.com]

Or you do something similar in your slicer. So what seems to work is a short retract, followed by an unretract but 0.5mm short of full distance, then a long, fast retract. This shapes the filament tail to prevent a long string which would possibly jam next time this filament is loaded. Also ptfe lined hotends like e3d lite6 rather than all metal seem to work better.

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Simon Khoury

Co-founder of [www.precisionpiezo.co.uk] Accurate, repeatable, versatile Z-Probes
Published:Inventions