The wire no longer came out of the nozzle

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Oliviers
Posts: 7
Joined: Thu Apr 13, 2017 7:09 am

The wire no longer came out of the nozzle

Postby Oliviers » Thu Apr 20, 2017 8:19 am

Hi,

In my last 5 impressions with PLA, I met twice the same incident. The wire no longer came out of the nozzle.
The nozzle has clogged or the gear no longer trains the wire.
During the last incident, to restart printing, I only reloaded the wire by helping it a little manually.
The next impression failed after 2 hours printing
Do you know where this can come from and what needs to be done to prevent it from happening again?

Thanks,
Olivier
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Vicky@Raise3D
Posts: 1732
Joined: Fri Mar 25, 2016 3:54 am

Re: The wire no longer came out of the nozzle

Postby Vicky@Raise3D » Thu Apr 20, 2017 10:38 am

If you meet same problem again, please do not stop printing immediately. Use your hand to help push the filament more into the nozzle to check whether the feeding can be continued.
And also check whether you can easily drag the filament out during loading.

Oliviers
Posts: 7
Joined: Thu Apr 13, 2017 7:09 am

Re: The wire no longer came out of the nozzle

Postby Oliviers » Thu Apr 20, 2017 11:01 am

That what I've done this morning. It start printing again but on the next printing it fail again after 2 hours

Jetguy
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Joined: Tue Mar 22, 2016 1:40 am

Re: The wire no longer came out of the nozzle

Postby Jetguy » Thu Apr 20, 2017 11:10 am

PLA material softens (not melting but softening called glass transition temp) at a lower temp than other materials like ABS.
As such, if you print PLA with the top acrylic cover on the printer, over time, the heat from the motors and the heated bed will rise from ambient room temp to the glass transition temp and make the PLA filament (you called wire) no longer hard and rigid to be gripped by the feeder gear system. Also, soft limp filament cannot be pushed by the gear at the top down the tubes and into the hot nozzle with pressure because trying to push a limp rope does not work.

You must print with the lid off or at least open for PLA. You may need to adjust the motor position to adjust the gap between the drive gear and V groove bearing to grip your specific filament. Check the stepper motor temperature with your hand and observe the temp of the entire feeder assembly in failure of feeding. If too hot, there is your problem.

PLA is a funny plastic material. The nozzle is not clogging, but excessive heat in parts of the feed path that must remain cool or just above room temperature can heat up and this causes a jam of PLA.

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walshlg
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Joined: Wed Mar 23, 2016 12:01 pm

Re: The wire no longer came out of the nozzle

Postby walshlg » Thu Apr 20, 2017 5:04 pm

you may also benefit from increasing the extrusion temperature by 10C


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