Dual extrusion problems

Hi,

I need some help in slic3r dual extrusion. I tried it with Slic3r version 0.98 and 0.99.
My problem is, that the second extruder gets way to small E-movement for extrusion (Gcode). So nearly nothing is extruded.
The first has normal extrusion and looks good.
The firmware works well, if I extrude both a defined length of filament everything is well calibrated.

Could anyone help?
Maybe this problem results of the print settings multiple extruders, as there I can choose not both extruders?
Thanks for your help.

i get the same problem. nobody out there, who gets a solution or a functional .ini?
thx
hd

Did you follow the setup as described in this post in repetier...? [forums.reprap.org]

---

My Environment:
Host for both 3D-Printers: Repetier Host: 0.90C, slic3r 0.9.10b prebuilt, win7 home premium 64bit
-Dual Extruder bowden printer: Repetier Firmware: 0.83, Arduino 1.05, Board: Azteeg X3, UBIS Hotends 0.35, Viki,
-Single Extrusion printer: Marlin V1, Arduino 1.05, PrintrBoard, UBIS Hotend 0.35

Hanspeter, www.funlab.ch

i get the same problem.
i tryed this one [forums.reprap.org] with no effect

Anyone got slic3r work with one extruder for ABS an one with PLA for Support.

thx
midopple

midopple Wrote:
-------------------------------------------------------
> i get the same problem.
> i tryed this one
> [forums.reprap.org] with
> no effect
>
> Anyone got slic3r work with one extruder for ABS
> an one with PLA for Support.
>
> thx
> midopple

I got one working ABS, the other HIPS for support. no real problems

Same problem.. E0 value is 1 unit higher every 10 lines in the gcode and E1 value is 1 unit higher every more than hundred lines.

I tried with Slic3r 9.9 and 9.10b and it's still the same. I tried to change the nozzle diameter value to see what happen and nothing change.

@1013 can you give more info about your setup?

Thanks

I just came across this thread and thought to add my experience with dual extrusion.

My machine is a Chinese clone (Flashforge Creator) of the Makerbot dual and I use ReplicatorG to process the STLs. This has a facility to combine two STLs into one gcode file for dual extrusion. Actually it slices the two STLs individually and then combines the two gCode files.

However I've had lots of difficulties with that. I won't bore you with the details but if it is of any interest I will be happy to elaborate. After trying all sorts of things I tried to use Slic3r to directly create the dual extrusion file rather than get replicatorG to combine two Skeinforge gcodes but I just couldn't get it to produce a printable gcode.

In the end I ended up with a partially home made solution. I slice the STL for the left extruder and the one for the right separately (as replicatorG would do) but rather than let replicatorG do the combining I wrote my own program to do that. Sounds simple but it took me more than a month to get it working properly, partly due to my poor programming skills but also due to unexpected problems which I attributed to bugs in the Makerbot firmware.

There were two main things, one that it seemed to lose track of the E values and mix up the left and the right sporadically and the other was that I was getting what appeared to be mis-stepping in the X and Y directions - which was odd since the speeds and accelerations were unchanged when I combined the files.

The e-values mix-up I worked around by not using the toolchange commands at all and instead using A and B values, incrementing one or the other according to which filament I am extruding. The X/Y offset of the second extruder is added explicitly to the co-ordinates rather than letting the machine add the in built offset.

The apparent mis-stepping turned out to be a by product of resetting the E value at the beginning of each layer (this was because I was lazy and this made programming a bit easier). In other words each time I reset the E value (and/or the A/B values separately) this would also affect the X and Y axes by a tiny amount, which resulted in severely skewed prints.

Making my own combiner also let me fix two important things, one that I got ooze under control (from the idle extruder) and the other is that I can control the sequence of laying down the different materials. The replicatorg files would print two layers with one extruder and two in the other. This resulted in even layers having the support printed before the main material and the odd ones having the main material printed first.

I am now finally at the point where I can reliably print dual extrusions but still working on some improvements. One thing I am trying to work out is to lower the temperature of the idle extruder and then bring it back up just in time when it is needed. Of course just turning it off and on is easy - the trick is deciding when to start heating again so it reaches temperature just before it is needed to start extruding again.

I've got dual extruders working just fine in Slic3r. I've used it for both ABS/PLA support and PLA/PVA support.

Hi,

i got same problem.
First i thought that e1 extruder pololu driver was damaged but after opening extruder and taking some dry runs i saw that Gcode must be wrong. Gcode is generated with Slic3r V0.9.10b
I am using same setup with 3mm a filament for both extruders and the only difference at hot ends is nozzle size of 0.35 for T0 and 0.5 mm for T1. Same Motors too. Let me place some some gcode sample here:

G92 E0
M82 ; use absolute distances for extrusion
T0
G92 E0
G1 F1800.000 E-2.50000
G92 E0
G1 Z0.300 F6600.000
G1 X74.670 Y77.160
G1 F1800.000 E2.50000
G1 X80.660 Y71.170 F1650.000 E2.69643
G1 X81.890 Y70.110 E2.73408
G1 X83.280 Y69.260 E2.77186
G1 X84.790 Y68.640 E2.80971
G1 X86.370 Y68.260 E2.84739
G1 X87.990 Y68.130 E2.88507
G1 X93.990 Y68.130 E3.02420
G1 X95.610 Y68.260 E3.06189
G1 X97.190 Y68.630 E3.09951
G1 X98.690 Y69.250 E3.13715
G1 X100.070 Y70.100 E3.17473
G1 X101.310 Y71.150 E3.21241
G1 X107.320 Y77.140 E3.40916 <<<<<<<<<<<<<<<<<<<- look here
G1 X139.330 Y109.160 E4.45901 <<<<<<<<<<<<<<<<<<- look here
G1 X140.390 Y110.390 E4.49667

you may see that for a xy difference of 32, 32 a difference of E is around 1.0 wit Extruder T0 (3mm/0.35)

now Gcode for Extruder 2 with 0.5 Nozzle:
G92 E0
T1
G92 E0
G1 X57.040 Y77.930 F6600.000
G1 X63.030 Y71.940 F1650.000 E19.24985
G1 X64.440 Y70.790 E23.38450
G1 X66.040 Y69.930 E27.51228
G1 X67.780 Y69.400 E31.64562
G1 X69.590 Y69.220 E35.77896
G1 X75.590 Y69.220 E49.41338
G1 X77.400 Y69.400 E53.54672
G1 X79.130 Y69.930 E57.65832
G1 X80.730 Y70.780 E61.77539
G1 X82.140 Y71.930 E65.91004 <<<<<<<<<<<<<<<< look here
G1 X120.160 Y109.930 E188.06143 <<<<<<<<<<<<< look here

wit a relative distance from x,y of 38, 38 i got E difference of 123 with Extruder T1 (3mm/0.5)

i think this is a mistake of a factor of around 100.

Does anybody have some hints ?

Regards,
Koepfle

I found a solution that finally works for me and the answer was in front of my face.

I used the latest slic3r (RC 1.0) but older versions work fine. On the main screen on the right side you will see two drop down boxes under the filament heading. In older versions this is below. I think this only comes up if you have two extruders defined but i haven't checked. The first drop down is for extruder 1 and the second is for extruder 2. What I did was to create two presets in the "filament" tab, one for each extruder, then you can independently set each one with their own multipliers etc. It's funny that this is how its supposed to work and yet we all missed it.

OK so dumb question I have a problem and hope it is a quick fix. I am using the newest version of repetier and slic3r. No matter if I slice in slci3r stand alone or in repetier, when I go to print the sliced object with my dual extruder it prints two layer of one filament and then prints two layers of the other. and back and forth like this causing at some point the nozzle to jam and clog and the project to remain un-finished. I have yet to read about anyone having a similar problem. Most of the other problem people are having I have yet to experience but this issue is driving me nuts.

Thanks

Edited 1 time(s). Last edit at 03/02/2014 11:30AM by maverickcnc.