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Sewing?

Posted: Sat Feb 23, 2019 4:03 am
by synergy41
Hello everyone,
Who can tell me on what parameter to play, I still can not find despite my different test on the retraction and others. There is always this really horrible seam,
I am with SD 4.1.1 is a Little Monster equip with an ED3V6,
I'm attaching my FFF file,
thank you
20190223_090324.jpg
TEVO LITTLE MONSTER test retract.fff
(9.32 KiB) Downloaded 71 times

Re: Sewing?

Posted: Sat Feb 23, 2019 3:54 pm
by Codex404
Im no 3D printing profesional, but this seems to me like under extrusion. There are multiple reasons which can cause a not so steady filament flow. The first thing I would look at is the temperature of the printhead. A higher temperature would melt the filament quicker and thus have a more steady flow.

If it only happened recently with the same filament, you might want to take a look at the extruder (the thing that feeds the filament to the nozzle). The gears might be slipping over the filament. I personally only had that when of the gears was misaligned, but it could also be that the gear has been worn down or the pressure is not good enough.

Re: Sewing?

Posted: Sat Feb 23, 2019 6:19 pm
by tonyno
Is that at the end or beginning of the layer?

If at the start, and if you have been increasing retraction, give decreasing it a try. Also look at your Extra Restart Distance.

Re: Sewing?

Posted: Sun Feb 24, 2019 7:08 am
by Codex404
tonyno wrote:
Sat Feb 23, 2019 6:19 pm
Is that at the end or beginning of the layer?

If at the start, and if you have been increasing retraction, give decreasing it a try. Also look at your Extra Restart Distance.
That is indeed something the OP should look at, but since the complete print doesnt look good (not just the seam) I think there are multiple issues.

Re: Sewing?

Posted: Sun Mar 03, 2019 10:40 am
by jimbalny
Have you looked into linear advance? It's a new feature in marlin firmware that lets you tune your printer/filament combo to account for over or under-extrusion in sharp corners http://marlinfw.org/docs/features/lin_advance.html