Prusa I3 pro B GT2560 failure active extruder: 0

[Quark]

Hello,

I just received my new Prusa I3 Pro B 3 weeks ago and after assembling it, everything works just fine.

After some prints, I wanted to improve the print quality by following the instructions in this video https://www.youtube.com/watch?v=w_Wb0i0-Qvo. I set the E-steps and suddenly the extruder stopped working and Repetier Host is sending the message active extruder: 0.

First I reflashed the firmware, but the failure was still present.

Seems to be an electrical failure or connection problem. I exchanged the stepper motors (incl. the wiring) from E- to X-axis and the now the extruder was working again (as X-axis), but the actual X-axis stopped working. So the stepper itself and the wiring is out of the way.

I also exchanged the A4988 drivers between all axes and the failure kept being on the E-axis.

Finally I resoldered the pins of the E-axis without success.

After swaping in a donor GT2560 board, everything is fine, so the failure definitely is in my control board.

Since I can't keep the donor board, I want to fix my GT2560.

Do you have any experience with this failure? I didn't find anything in the forum so far, maybe I used the wrong search strings.

I already asked Geeetech for a replacement control board, but they only referred to this forum.

Your advice is very appreciated, since I want my 3D printer to work again.

Thanks a lot in advance and cheers,

Quark

[William]

Hi,
You mean the filament didn't come out or the extruder motor didn't rotate at all?
Have you checked all of this like the driver voltage?
http://www.geeetech.com/forum/viewtopic ... 19&t=17097
I think you can attach a video about your test(Youtube link plz).

[Quark]

Hello William,

the extruder stepper motor doesn't rotate at all. The driver voltage is just above 0,8 V.

[Quark]

Hello,

I tried it after letting it sit over night and now the extruder is kind of working.

The message active extruder: 0 now comes up sporadic. The extruder motor stops working during extruding and active extruder: 0 pops up. I can start a new extrusion, but the amount of filament, that is pulled into the hotend is absolute random.

Any ideas? Looks like a sporadic overload/failure on the extruder signal line. I exchanged the stepper drivers again with no change of the behavior.

Thanks for your help

Quark

[William]

Ah,i have some ideas in my mind.You have a Pro B,that is to say,the extruder 1 socket on your board hasn't been using.
So i think you can change the pins on extruder 0 and extruder 1.Refer to the following post to have a try:
http://www.geeetech.com/forum/viewtopic ... 20&t=18020

[Quark]

Hello William,

thanks a lot for your reply. I tried the fix you proposed with a known good stepper and wiring on both extruder headers and still, the motor is not moving at all and I keep receiving active extruder: 0.

Also today (after letting it sit over night again) the extruder motor is not working at all. Pretty frustrating for a 3 weeks old machine.

Do you have any additional idea I can try or is my board toast?

Thanks and cheers

Quark

[William]

If you've modified the firmware and uploaded it,and the extruder still didn't work.I think the extruders' pins output has a problem,you can ask the seller for a replacement.