baxi
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Posts posted by baxi
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How to figure out if it's printed CW or CCW?
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6 hours ago, neotko said:
The slower the acceleration and jerk the bigger the issue. Assuming you have a um2 it should be 3000/20
Try to print it rotated 45 degrees. If the problem goes away I would triple check also x/y alignment of the axis
Thx for your ideas.
Maybe I will try higher acc later.
I already turned the print with no change in the shift. So it's not an axis problem.
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Finished now the slow print, speed 40/20, Acceleration 300, Jerk 7.
No change, the line shift is still there.
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1 minute ago, UbuntuBirdy said:
Could it be the height where the heat from the bed no longer reaches the layers but the fans are at 100% (perhaps the fans reach at exact this layer 100% and the temp at the nozzle drops down until the heat element can correct the temp) and their air is reflected from the bed so the layer is cooled twice?
Thx for the idea.
I found this shift in all distances to the bed, from 2-3mm to 40mm highest. So I would guess this is not the reason. Esp. in the benchy I can move the layer shift up and down by setting different top layer numbers.
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I printed now 18 with Cura and all have the same issue.
On 4/30/2019 at 6:34 AM, baxi said:But it is caused by the lowest layer of the top which is in the back of the benchy.
By changing the number of top layers this line moved exactly as expected.
I can very exactly predict where this shift will be.
And I changed almost all parameters in many ways.
Acceleration and jerk have been off in first 15 prints, so firmware
values were used. Slic3r used the same and made no shift.
Right now a 2nd test with more lower speed, acceleration and jerk values is printing.
If this has no effect, I will do some test with 1 layer top and one with zero.
Maybe this will deliver some usable info...
And after I know where and how to look I found these layer shift problem at lower top surfaces at almost all of my prints. Beside this problem, the prints are surprisingly perfect considering that my part cooling is still a crap. I print mostly tech parts in which you do not really see this problem. It is the special shape of the benchy hull which makes this problem very clear visible and measurable.
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@neotko Nice tool thx.
But I see nothing in there.
On 5/4/2019 at 3:56 PM, neotko said:shifting the color
It is not shifting the color, it is shifting the wall 1 line width to the front.
On 5/4/2019 at 3:56 PM, neotko said:This an issue of any fdm. At 0.15-0.2 layers
I print 0.12
On 5/4/2019 at 3:56 PM, neotko said:Since there’s no slicer out there that can compensate time va heat va flow
As S3D and Slic3r don't have this line shifting problem, we can exclude this topic as reason.
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So the good news is, that I was finally able to remove the layer shift in the benchy with test print #15.
The bad news is, that it was sliced with Slic3r...
But this finally proves, that this is a Cura problem, and hardware problems can be excluded from the list. And as I tested so many different parameter settings, I would finally say the chance that this is a bug is very high.
I also noticed, that all other but 2 minor line problems (including 2 other shift locations) are gone in the #15 print. As it was my first print with Slic3r at all, and I did only transfer the Cura profile to Slic3r, the overall print quality is ok but worse than the benchies made with the calibrated Cura.
So is there a way to do a bug report about this?
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Tried with 200° instead of 210°. Zero effect on the shift, made the over all print quality worse.
(210° seems the best on my temp tower for this filament..)
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Changing the infill pattern and the top/bottom pattern did not have any impact on the shift.
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The overextrusuion test had a positive effect only one one small surface at the front of the benchy. Everything else got worse. There is no effect on the layer shift, still there.
The next tests will be with over infill. Maybe this changes something.
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So printed 2 tests.
#9 MaxComb 20 + Z Seam User Specified --> The layer still shifted, but went up to highest layer of top.
#10 MaxComb 20 + Z Seam Sharpest Corner --> Layer shift like before in 9, but print quality over all got very bad.
So I will take out MaxComb again and try so overextrusion.
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I will try the above soon and give feedback.
I don't think that I have too much cooling as I still have a very small fan on it. In opposite I still have the typical marks for too small cooling at the benchy and other parts.
Meanwhile I made the benchy with 0.3 line width. This had a lot of positive effects on other parts of the benchy, but esp. this shift got much worse. In fact it was the only part which got worse.
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Until now I could not create a good square sample.
So I attach the benchy files.
It's 4 files from 2 tests. Test no. 3 (very slow 1st layer to get the first layer very good).
And test no. 4 which only changed parameter is the thickness of the top changed from 10 to 3 layers.
I got the expected result, that the shif-line went up ca. 0.9mm.
#4_F#4_as#3_3TopLayers_3DBenchy.3mf #4_F#4_as#3_3TopLayers_3DBenchy.gcode #3_F#4_noCoasting_flow96_ILS10_3DBenchy.3mf #3_F#4_noCoasting_flow96_ILS10_3DBenchy.gcode
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1 minute ago, smartavionics said:
Thanks. Actually, the STL isn't much use on its own. Far better is to save the project and attach the .3mf file as that has both the model and the settings.
Ok I will. I always store the .3mf files for all tests.
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1 minute ago, smartavionics said:
Hello @baxi, please attach the gcode file that exhibits this problem.
I will, but later.
Right now I try to construct some part in which this problem will be shown better.
And smaller, easier to do research with.
I will then post STL and gcode here.
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I changed comb, no change as expected.
I calibrated the printer in many different kinds.
I can for sure exclude any axis or extrusion problems.
The full layer shift here is proven, so is the top layer as reason.
I printed already a lot of technical parts with now "lower top layers", and they all came out amazingly perfect.
Including Screws and nuts which work perfect without any need to refinishing them.
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TY I will try it, but I am sure that it is not underextrusion at all. The extrusion is quite good, just the layer is shifted.
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I have the exact same problem. I did a lot of testing with it (Cura 4.0).
This is a layer shift of 1 wall-width size.
It shifts from the end of the benchy to the front.
Until now I was not able to find a solution for this.
In preview and reloaded gcode there is no shift.
But it is caused by the lowest layer of the top which is in the back of the benchy.
By changing the number of top layers this line moved exactly as expected.
Turning the benchy 90° also changed nothing. So it's not an axis problem.
Many people have the same problem.
Knowing what the problem is I looked to other prints I did with tops laying inside the model, and they had the same problem.
So this bug is not a benchy specific problem.
Benchies printed with other slicers also don't have this problem. It's Cura specific.
Darker layers always on the same layers
in UltiMaker Cura
Posted · Edited by baxi
Ah, there is no horizontal slider....
Btw. i have the Linux version.