slant lines
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@arhi The pulsing could be caused by the flex cable not turning consistently/smoothly, but as @matt3o has tried it with a NEMA 8 motor (replacing the flex cable) and still has artifacts, it does seem the worm gear is most likely responsible. As I said waaaaay back at the beginning of this thread!
Ian
TronXY X5S with Duet 3 MB6HC and Roto toolboard : Cartesian bed-slinger with Duet 3 Mini 5+ WiFi and 1LC : RRP Fisher Delta v1 with Duet 2 Maestro : Polargraph with Duet 2 WiFi
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@droftarts yup, only I replaced the hotend and the shaft and the gears are still the same but lines are gone
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It might be your shaft that caused the issues too. If could have been was pulling and yanking the little worm around. The period of the errors are the same for the worm and the cable.
I like your bracing mechnism holding the shaft in place. -
@bondus possible, that's probably why shaft broke and that's why I added that bracing mechanism so that it does not break again. The worm sits in the two bearings, one on each end, it's not really yenkable
that easy. Dunno, important that it's gone and was never there before too. Jason sent me new shank that I'm expecting every day now. He said that the new one is much thicker then the original one I had and that it shows improvements over original one too. We'll see, I was pretty happy with performance so far 
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@arhi said in slant lines:
The worm sits in the two bearings, one on each end
The worm sits on just 1 bearing, the other on top doesn't hold the worm but it is just leaning on it. That is in my opinion the first design issue with that extruder.
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holy s*$#t!
So I put a bondtech extruder in direct drive on a mosquito. I had to redo the whole head, but I had to try.
The overall quality is good but.... I still get the slant lines! They are completely different but they are still there. I am going nuts! I don't know what else to try...
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Have you tried a different driver for the extruder yet?
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@matt3o, if you print a box with a thin single perimeter wall, do you see the lines on both sides of the wall? If so, are they symmetric or opposite?
(trying to distinguish between X/Y irregularity and extrusion width irregularity.)
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@Phaedrux said in slant lines:
Have you tried a different driver for the extruder yet?
I tried on a new driver on the duex5, no difference. Do you think it is woth trying on the main duetwifi?
@zapta said in slant lines:
@matt3o, if you print a box with a thin single perimeter wall, do you see the lines on both sides of the wall? If so, are they symmetric or opposite?
(trying to distinguish between X/Y irregularity and extrusion width irregularity.)
The pattern is the same on all sides, from bottom left to top right (this time). Looking at the same side the pattern is the same in the inside and the outside.
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@matt3o said in slant lines:
Do you think it is woth trying on the main duetwifi?
When you're grasping at straws... why not?
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@Phaedrux said in slant lines:
When you're grasping at straws... why not?
Yes, that's correct. Possibly having larger pulleys on the secondary belt will allow to reduce tension there without increasing backlash (and having non equal pulleys may allow increasing the steps/mm).
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@matt3o said in slant lines:
The pattern is the same on all sides, from bottom left to top right (this time). Looking at the same side the pattern is the same in the inside and the outside.
Do you mean that where it bulges on one side of the wall it also bulges on the other side of the wall? If so I would think it's uneven extrusion.
(I presume it's not related to Z issues such as automatic bed mesh compensation which can also affect the extrusion width).
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I tried 2 drivers on the duex and 1 on the duetwifi. No difference whatsoever. @Phaedrux thanks for the suggestion, I really hoped that would work.
I changed cables. Niet.
I tried a new motor. Nada.
What the f...
@zapta the texture is so faint that I can't really tell what XY direction it is going. I'd probably need a microscope, I'll try to take some macro shots but I don't know if that would be enough.
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@matt3o said in slant lines:
@arhi said in slant lines:
The worm sits in the two bearings, one on each end
The worm sits on just 1 bearing, the other on top doesn't hold the worm but it is just leaning on it. That is in my opinion the first design issue with that extruder.
You sure? I know the original design I had was holding both bearings strongly... will check the G5
there are bearings on both side ... ah you are right I just checked the worm does not go in to the bearing on top only the flex goes trough the bearing
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@zapta said in slant lines:
Do you mean that where it bulges on one side of the wall it also bulges on the other side of the wall? If so I would think it's uneven extrusion.
That's what I had (have on this print I dug from the trash). The Z is even, the XY is even the amount of plastic varies sinusoidally.
(I presume it's not related to Z issues such as automatic bed mesh compensation which can also affect the extrusion width).
nope, not Z related I'd say
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@matt3o said in slant lines:
So I put a bondtech extruder in direct drive on a mosquito. I had to redo the whole head, but I had to try.
are they the same frequency as the one you had with flex3drive. Bondtech also comes with a gear
what else to try
I'd up the current on the extruder motor to try out that too
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@arhi said in slant lines:
You sure? I know the original design I had was holding both bearings strongly
the top bearing doesn't hold the worm gear, it is just leaning on it. so if the shaft end is just slightly bent the top bearing will help very little.
@arhi said in slant lines:
I'd up the current on the extruder motor to try out that too
I'm afraid I tried that already
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@matt3o yes, I opened it up .. the worm is not going in the top bearing
.. dunno if the top bearing is tight around the flex ... anyhow, I don't have slant lines with flex3drive+e3d, had with flex3drive+mellow. you have it now without flex so there must be something else -
okay, it took me a while but I reprinted all the pieces of my printer with a stronger filament. Changed motors. Changed pulleys and idlers and checked them with a dial gauge. Tried various belt tensions.
The result is always the same and it's very frustrating.
The only things left to try are the leadscrews (which I ordered but with covid19 who knows when I got them) and wires. Could it be interference? I connected all motors and rails to the frame and then to ground, so that is covered.
It really looks like a problem with the extruder but I get the same issue with all the extruders I feed to it. So I'm really out of clues now.
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@matt3o, not sure what you have already tested but if you think it's extruder related, you can try changing the extrusion width in your slicer and see if it changes the slope of the slanted lines.
My thinking is that if its' something cyclic in the extruder, changing the width will change the x/y length per extruder cycle.
Does this make sense?
