ABS filament feed problem

A forum dedicated to the stock LulzBot Mini 3D Printer
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Joined: Mon Dec 17, 2018 12:06 am

ABS filament feed problem

Post by zizumara » Mon Dec 17, 2018 12:24 am

I have had my Lulzbot Mini for a couple of weeks now and have been printing almost every day with ABS filament. Today it stopped in the middle of a 2 hour print. A test extrusion failed to extrude filament. Removing the filament revealed that the filament had a gouge in it made by the hobbed bolt. I cleaned the hobbed bolt and the print nozzle and tried again several times to get the filament to feed, getting the same results -- the hobbed bolt would gouge the filament and stop feeding.

I noted that a few other posts noted problems like this with two possibilities: heat creep and idler screw adjustment. I ruled out heat creep because that is supposedly a problem with PLA only and the worn part of the filament wasn't warm whenever I removed it. Another post stated that the separation between the washers on the idler screws should be about 5 mm. Though the distance appeared to be about 5 mm, I tightened them to be a little less than 5 mm and this seems to have cured the problem for now.

I thought I would share this information in case anyone out there sees the same problem and, heaven forbid, if my feed problems should return.

Aleph Objects | LulzBot
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Re: ABS filament feed problem

Post by Ehoff » Thu Dec 20, 2018 9:00 am

Sometimes over tightening the thumbscrews can cause the toolhead to strip out the filament like you are describing. If the problem returns, try loosening them up just a little bit.

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Joined: Wed Dec 19, 2018 7:42 pm

Re: ABS filament feed problem

Post by edsunder » Thu Dec 20, 2018 10:53 am

The other thing that I've noticed is that sometimes the way a particular print is done, there is so much fast extrusion, retraction, extrusion, retraction quickly that it will cause that wear. I've found that by either slowing things down a little bit or by changing the retraction distance, I can normally make that go away. This is the type of thing you'll sort of figure out over time.

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