1 Topic by zgundam928

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Topic: Davinci Jr. Extrusion Stopping Mid-Print

I tried to print various files out, but the printer would stop extruding filament about halfway through the print process. The hot end is still hot enough to melt the filament. Why does the filament not extrude later when it is working well at the beginning? Thanks.

2 Reply by carl_m1968

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Re: Davinci Jr. Extrusion Stopping Mid-Print

Could be a partial clog, bad filament, yes it happens. Or could be an issue with the feed gear being mucked up with filament debris or it may be hot but not hot enough to melt the volume you are feeding it. There are a host of things that can cause your issue, you just need to try and address each one and rule them out.

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3 Reply by jagowilson

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Re: Davinci Jr. Extrusion Stopping Mid-Print

All of the things Carl said plus make sure you have enough tension on your extruder if it is adjustable.

4 Reply by Bozotclown1970

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Re: Davinci Jr. Extrusion Stopping Mid-Print

Also make sure that the filament is free on the spool. Some filament tends to get wrapped crisscross and gets hung up on the spool every now and then. Also, I changed my filament feeder on my JR and fixed 99% of all of my feeding issues. The XYZ feeder is HORRIBLE!

5 Reply by gadjet

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Re: Davinci Jr. Extrusion Stopping Mid-Print

I have a friend who keeps his printer in the garage and his printer stopped extruding mid print and we spotted that as it had been raining for a couple of days the PLA had absorbed moisture and was 1.85mm and was jamming in the hotend, he dried it uot for a couple of days in the house and all was well.

6 Reply by vvasilev

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Re: Davinci Jr. Extrusion Stopping Mid-Print

Bozotclown1970 wrote:

Also make sure that the filament is free on the spool. Some filament tends to get wrapped crisscross and gets hung up on the spool every now and then. Also, I changed my filament feeder on my JR and fixed 99% of all of my feeding issues. The XYZ feeder is HORRIBLE!

Because i have the feeding issues too, how did you change it ?
with new one by XYZ or some other ?

7 Reply by Bozotclown1970

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Re: Davinci Jr. Extrusion Stopping Mid-Print

Well, I just spent about 1/2 hour looking throught my PM's and posts and could not find the links, but I posted somewhere in here the parts I ordered and used. You have to replace the bracket and stepper motor which is very easy to do.

8 Reply by vvasilev

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Re: Davinci Jr. Extrusion Stopping Mid-Print

Thank you

9 Reply by yizhou.he (edited by yizhou.he 2017-11-28 17:42:43)

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Re: Davinci Jr. Extrusion Stopping Mid-Print

I have stop extruding in middle of print issue before. There are three potential cause of these.

1. The fan not cooling enough, and after long time printing, the heat accumulate in hotend and cause PLA to expand and jam the throat of the hotend. You can tell by unplug the filament when hotend is >180C and see if the end of filament is bigger in diameters and the length of expansion is longer than 5mm. The accumulation of the heat takes time lead to delay on the jaming.

2. Repeated retraction lead to Grinding Filament in extruder, this issue can be resolved by change in retraction setting or simply rotate you model before printing. You will find broken filament at extruder position and the grinding takes time  lead to delay on the jaming.

3. Extruder overheat, it takes time to accumulate heat, and when temperature raise, PLA become soft, therefore you have trouble to extrude. You can dignose this my feeling the extruder motor temperature after 30 minutes printing see if it gets warm or hot. You will also notice noise when trying to extrude (not click noise, but emits a high frequency noise). If your Jr. is ramps converted, adjust the motor current on E motor drive can solve the problem. If your Jr. is everything stock, you can only solve this problem by add cooling fan to the extruder.

In any of the case, replace the extruder motor of same model are unlikely fix the problem, you will have to use extruder that can handle higher motor current.

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10 Reply by betmeup (edited by betmeup 2018-08-25 11:35:31)

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Re: Davinci Jr. Extrusion Stopping Mid-Print

I can say... its the feeder spring.

If you are using soft filament, then the metal feeder wheels squeeze the filament (while extreme retraction), so that the filament in the hotend is not round enough and will be clog.

I thought it was the temperature, fan, or bad filement, but no, its the feeder wheels + spring :-)

You can test it: remove the whole filament, then take a short part (50 cm) and let it flow through the feeder, then pull it back. When it is no longer smooth and round, then the feeder spring is to hard.