My little “saw tooth” problem.
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Here’s a photo of what’s happening. I was hypothesizing that it was a z-step issue after trying every suggestion thrown my way. It seems to “reset” every 4 or 5 layers, then compound over the next few layers again. It’s only in the corners. The sides are perfect!
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EDIT: it is only in the corners - Then I might suspect it is the retraction - Try to change seam position to "Aligned" and see if it only occurs on the corner where the layer starts / stops
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Simplify3d?
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yes, simplify 3d
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it doesnt happen to match the pitch of your z axis leadscrew does it?
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I do see that the saw tooth (Bulge) is happening where the perimeter stops. when it finishes the outside pass, it leaves a little blob. The reason it's in all 4 corners, is because simplify 3d was staggering the seams. they all end up in the same place if I align the seams.
I'm reading and reading up on retraction, but I am not finding anything that really pertains to the duet. Is retraction in the slicer, or in the firmware?
I see no retraction settings in my config.G
is anyone familiar with A Duet / BMG / E3Dv6 / Simplify 3d setup that could explain where I might look to adjust retraction?
Thanks!
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Retraction is done in the slicer - For S3D, you can see it here:
https://3dprinterchat.com/wp-content/uploads/2017/04/FFF-Settings-600x365.jpg -
@martin1454 Unless they're using firmware retraction (G10/G11), then it is a M207 setting in config.g.
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@stephen6309 said in My little “saw tooth” problem.:
@martin1454 Unless they're using firmware retraction (G10/G11), then it is a M207 setting in config.g.
Well, S3D does not support it "natively" - You can do it, but it is a bit tricky.
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@steve-lynch said in My little “saw tooth” problem.:
I do see that the saw tooth (Bulge) is happening where the perimeter stops. when it finishes the outside pass, it leaves a little blob. The reason it's in all 4 corners, is because simplify 3d was staggering the seams. they all end up in the same place if I align the seams.
I'm reading and reading up on retraction, but I am not finding anything that really pertains to the duet. Is retraction in the slicer, or in the firmware?
I see no retraction settings in my config.G
is anyone familiar with A Duet / BMG / E3Dv6 / Simplify 3d setup that could explain where I might look to adjust retraction?
Thanks!
I have the same combo on my printer, direct drive. My retraction settings in s3d are 1.1mm at 50mm per sec 3mm wipe and no coast. Works well
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@martin1454 S3D does support firmware retraction natively although it uses different Codes for it but RRF was altered to accept them some time ago.
Doug
it is the include M101/M102/M103 commands setting
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@dougal1957 said in My little “saw tooth” problem.:
@martin1454 S3D does support firmware retraction natively although it uses different Codes for it but RRF was altered to accept them some time ago.
Doug
it is the include M101/M102/M103 commands setting
Also remember to dissable "Retraction" on the extruder tab
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The M101/102/103 commands don't do a perfect job. I forget the details, but there is some situation in which the commands are not correct for controlling firmware retraction.
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@dc42 Ah OK David I wasn't aware of that as I don't use S3D anymore so won't have run into that issue
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@DC42 I have all but eliminated my problem from what I can see. However, I'm concerned about how I did it. I have tried every combination of speed, accel, Jerk, extrusion multiplier, retraction, etc.... What seemt to have killed the problem was Pressure advance.
Here's My concern though. I have pressure advance set to 0.14 that seems an awful way off from .05. Is this a problem? My prints look amazing, I have no artifacts, no under extrusion, and almost no blobbing in the corners now.. I can't feel them, but if I hold it in the light, I can see a slight change in the reflected light. (if you know what I mean) Non squares are looking perfect! I printed a carbon fiber bust of a naked woman, and it looks super for the settings I used (a little better quality than fast in Simplify 3d)
so, Am I covering up a bigger problem, or is this what Pressure advance is there for?
Thanks!
Steve
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@steve-lynch I think that if your prints are looking good you must be doing something right.
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If pressure advance of 0.14 works well for you, stick with it!
The required pressure advance depends mainly on the length of the Bowden tube between extruder and hot end (longer = more PA), and on how sloppy the fit of the filament in the Bowden tube is (more sloppy = more PA). But it also depends on other factors such as motor current and gearing (low motor current needs more pressure advance, so does low extruder steps/mm). The suggestion of 0.05 sec pressure advance for non-Bowden extruders is just a starting point.