1 Topic by volvodr66

  • volvodr66
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Topic: Banding on prints?

Does anyone have any idea why I’m getting this banding artifact on my prints?  See pictures.  It seems to happen after an opening when the nozzle has to turn off the filament, like when crossing an opening, and turning it back on.  This makes me believe it has something to do with my retraction settings but I don’t know which way to go with it.  Increase retraction, increase speed, decrease speed, etc.  I’m using 3D Solutech PLA at a temperature of 215C which is what was shown to be the best on my temperature test.  My printer is a Davinci Pro 1.0 with a E3d v6 hot-end with an added print cooling fan.  I’m using Simplify3d and my settings are layer height .20mm, extrusion width – auto, retraction distance 2.0 mm, extra restart distance -0.60 mm, retraction speed 20 mm/s, coasting distance .10 mm/s, and coasting at end enabled.  My default printing speed is 4 mm/sec.  This was printed with supports in the windows which were removed after the print was finished.  I think I’m going to run a couple of test prints with a 3 mm thick wall with several “windows” with different retraction settings and see if I can get any better results.  Any suggestions on what settings I should try.  I’ve heard that with the E3d hot-end you’re not supposed to go over 2 mm retraction because you will pull hot filament into the cold zone of the nozzle possibly causing clogs.  What are your thoughts on this?  Have you guys or gals have success using larger retraction settings?

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2 Reply by carl_m1968

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Re: Banding on prints?

Looks like moisture in the filament to me. How long has the filament been exposed to the air?

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3 Reply by volvodr66

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Re: Banding on prints?

Filament is fairly new. I’d say only about three or four weeks old and stored in the plastic bag it comes in when not in use, but the bag IS open at the top.  I just fold the top over and put it back in the box it comes in.  I do leave it out for a day or so at a time when I have it on the printer in use.

4 Reply by yizhou.he

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Re: Banding on prints?

print speed 4mm/s or 40mm/s? Try reduce print speed, I see lots of ringing/ghosting, it is too much even for 40mm/s, if reduce print speed helps, you need to identify the source of vibration on your system.

I would agree with Carl if the artifact is all over your print, but it seems like only small portion of your print is affected. I don't know if small part of the roll is expose to moisture can cause this.

I would try raise nozzle temperature and reduce print speed to 20mm/s-30mm/s and see if that improves the quality.

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5 Reply by volvodr66

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Re: Banding on prints?

Gotcha, I'll try reducing the print speed first to see if that helps them go after temps.  If still no improvement I'll try another roll of same type filament. I should be able to report back tonight with results. Thanks.