Rostock 301 extruders not working

[Ieesha]

I have a Rostock 301. It has been completely assembled, but the extruder motors on 2 of the 3 extruders are not working.
I have tested the motors and wiring and the problem appears to be the actual motor on each, the motor makes a sound but the shaft will not move as it is supposed to.
I have requested a replacement but have been told I can not without posting on here and technical advising this is a terminal problem, I have already had issues that one of the stepper motors does not work and screws required also missing. Getting very fed up of the problems, can anyone advise what else I can do re: the motors on the extruders which do not work.

[William]

Hi,
What you exactly mean "but the shaft will not move as it is supposed to"?You mean the 2 of them didn't have filament coming out?And did you plug filament into it?If you did,
1.unplug the filament and heating up the extruder to the melting/preset temp.

2.Take down the fans on the extruder motors,then "Prepare->Move Axis->E0/E1/E2" to test the movements of the 3 extruder motors,a video about your testing would be appreciated.

About the motor vibrates,it maybe the driver module A4988 has a problem,like it didn't have sufficient voltage.Check the following tips plz,of course you can skip the step checking the direction of A4988,it must be right:
http://www.geeetech.com/forum/viewtopic ... 17&t=17038

[Ieesha]

Tried all of the suggested 1 of the 3 works, but the other 2 still are not.
We have tried them with filament and without we have tried all the suggestions still the other 2 extruders will not work, it is as if the shaft is jammed and will not rotate.
Can you please send 2 replacements extruders.

[Ieesha]

We have tried everything you have suggested and the extruder motors are dead for 2 of the extruders.
Please forward replacement motors as soon as possible as this is required for a school project.

[William]

We have tried everything you have suggested and the extruder motors are dead for 2 of the extruders.
Please forward replacement motors as soon as possible as this is required for a school project.

Hi,
Sorry for the inconvenience to you.I understand how are you feeling now.
Cuz the replacement will be reviewed by the manager,please understand that.
So could you attaching a video link about your test,of course more details would be appreciated.
The details including that :
take down the fans on extruders and unplug the filament,the driver voltage test,swap the driver with the working one,swap the motor wire of problem motor with the working one.
Thanks in advance,we'll make the resend once we verify the problem.
Regards

[Ieesha]

We have taken it to a 3D print specialist who has also tested it.
They have advised the plugs and cabling were loose and not connecting they have redone the wiring to the plug harnesses and we have life,in all 3 extruders now.
However the print head keeps the heated and we are unable to ascertain why or solve the problem help please!

[William]

We have taken it to a 3D print specialist who has also tested it.
They have advised the plugs and cabling were loose and not connecting they have redone the wiring to the plug harnesses and we have life,in all 3 extruders now.
However the print head keeps the heated and we are unable to ascertain why or solve the problem help please!

A video please so i can learn more about your issue.

[Ieesha]

Keep trying to upload a video but the extension mov is not allowed, do you have an alternate email address so can send

[William]

Keep trying to upload a video but the extension mov is not allowed, do you have an alternate email address so can send

You can attach a link if you've upload it to a site or send a email to william.guo@geeetech.cn

[Ieesha]

Sent to the email