Extruder problems

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Extruder problems

Post by twcartmill » Mon Mar 17, 2014 4:38 pm

Has anyone ever encountered any problems with the filament not being fed through the extruder? The printer starts the print jobs as normal but at random points throughout the job it stops extruding but the program keeps running as normal. I think the problem is happening because either a) The teeth on the stepper motor don't have enough grip to pull the filament through or b) something is blocking the filament on its way through the nozzle therefore the stepper motor cannot physically feed the filament through. I have stripped the head and nozzle, and cleaned what I could get to but this has not helped. There is now a juddering action coming from the machine as the stepper motor is gripping the filament and trying to feed it through.

Has anyone any good advice about this situation?

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Re: Extruder problems

Post by Astro » Thu Mar 20, 2014 9:10 am

Hi Twcartmill,
A couple of question pop to mind.
Have you been able to print with this plastic previously?
What sort of plastic are you using?
What temperature/percentage is your extruder reporting during the print?



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Re: Extruder problems

Post by JuliaDee » Fri Mar 21, 2014 2:53 am

twcartmill wrote:Has anyone ever encountered any problems with the filament not being fed through the extruder?
Yes, everyone has had this problem :)

The first thing to determine is if you have blockage or slippage. Blockage is easliy recognized by the feed stepper "clicking". Slippage is characterized by the lack of stepper clicking.

Slippage can be caused by the feed gear not being aligned with the pressure roller; sometimes the gear works itself out on the shaft. Could also be undersized filament.

Blockage on the first layers can be caused by too high a bed height, but this usually goes away as the print progresses. In mid-print it's either oversized or oval filament, or a clogged nozzle. To unclog the nozzle you need to clean not only the 0.4mm aperture, but also the 1/16" chamber behind the aperture. Or get a new nozzle. Put a piece of foam sponge inline with your filament path on its way to the printer in order to clean off dust and reduce the likelihood of further clogs.

Blockage also frequently accompanies changes in materials. Make sure to "flush" old filament out by manually extruding a bunch of the new filament at max temperature.


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Re: Extruder problems

Post by pleppik » Mon Mar 24, 2014 12:54 am

This can also happen if you have a bad batch of filament which has too large a diameter at certain points. This used to be common, but quality control has gotten a lot better at filament manufacturers the past two years.

It can still happen, though. Check the filament for any visible bumps, and get a caliper and measure the actual diameter. If it's over 1.85mm, that's probably your problem.

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