Prusa upgraded to duet, weird extrusion
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The primeter walls seem to be perfect when looked from above though.
Now that I zoomed the picture in, it seems microscopically blobby..?
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Were you able to test a different driver yet?
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I will right now.
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Same..
The light is non uniform but all of them look semi identical.
Left to right: the original one, 45 degree, 45 degree + swapped driverI made a video while printing this one:
Raise your volume a lot to hear the pulsing:
https://www.youtube.com/watch?v=wpG9eKp1ytAI know it's not the bondtech gear or the shaft for sure, as it is spinning slowly and pulsing dozens of times per rotation. Same was with the other motors.
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@Murloc992 said in Prusa upgraded to duet, weird extrusion:
Same was with the other motors.
Does the pulsing include your original 1.8º motors?
Ian
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No, in the beginning of this thread I posted some older pics using the old motors. All I had were VFAs and ghosting.
Actually in one pic I see faint diagonal pattern. I will test in the morning.
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I was gonna say i know what it is since i had something similar, when you said the motors didnt have flat spots i thought the set screw stands out too far and hits the other gear when doing a full rotation and presses the two apart for a second, but since you said it happens multiple times per revolution it cant be that... but might not hurt to check the set screw is flush anyway?
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It's not the set screw sadly. The extruder motor has a flat spot originally, others didn't but now have. A small metal file helped me with that.
Another interesting observation with the new motor:
10mm/s, 5mm/s extruder moves = smooth, but noisy.
1mm/s moves = pulsing is intense even without engaged gears.Old motor:
10mm/s, 5mm/s extruder moves = pulsing very very silently, but rapidly.
1mm/s moves = pulsing extremely, even more than the new one, but more silently.Video:
old motor, 800mA driver, 1mm/s retract move without engagement.https://youtu.be/rdDz5NVbe4k
(Increase the volume, a lot)https://youtu.be/LKBhyVVs9oE
(Can be heard way better in this one)Could it be the power supply? It's 3++ years old and has seen its fair share of life..
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@Murloc992 do you get the pulsing on extrusion with just extrusion not printing?
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@T3P3Tony said in Prusa upgraded to duet, weird extrusion:
@Murloc992 do you get the pulsing on extrusion with just extrusion not printing?
Every case is pulsing. Motor disconnected from the gears, connected to gears without plastic, extruding,etc.
I am getting an oscilloscope in the evening to check if I have PSU noise.
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@Murloc992 it would have to be extreme PSU noise I think to see regular pulsing on the extruder, also you say there is no pulsing on the X and ?
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@T3P3Tony said in Prusa upgraded to duet, weird extrusion:
@Murloc992 it would have to be extreme PSU noise I think to see regular pulsing on the extruder, also you say there is no pulsing on the X and ?
No pulsing can be heard on X and Y as they can be damped by the belts. I just returned my PSU to 12V, so I will see what that does.
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Even after setting my PSU to 12V it is the same.
The PSU dips to 11.4V while printing.
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can you try printing the cube slightly bigger and smaller (5-10%) so we can see if the angle of these artifacts stays the same? if it changes i‘d be inclined to say it is extruder, if it stays the same i‘d be inclined to say it is something mechanical apart from the extruder
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I did what you asked for: 90%, 100%, 110%
Even though my eye sight is bad, I think they are all different?
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Yes i can see in the first pic that the angle is different.
So its 99% extruder related.
Have you checked for any debris in the meshing gears? Especially when you grease them stuff can stick to it.
Can you also uninstall the stepper, turn it by hand and feel any crunchyness? What do you feel in comparison when you turn the 1.8 degree stepper? the 0.9 should feel substantially smoother -
@NitroFreak said in Prusa upgraded to duet, weird extrusion:
Yes i can see in the first pic that the angle is different.
So its 99% extruder related.
Have you checked for any debris in the meshing gears? Especially when you grease them stuff can stick to it.
Can you also uninstall the stepper, turn it by hand and feel any crunchyness? What do you feel in comparison when you turn the 1.8 degree stepper? the 0.9 should feel substantially smootherThe gears are clean, the motor feels insanely smooth and non crunchy.. The old one feels much harder to turn by hand, at least twice.
I am running out of ideas.
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Another interesting observation: my bed is making a clicking noise..??
It's a brand new 12V MK52 magnetic heatbed for prusa MK2.5. The PSU is not clicking, DUET isn't too. The clicking originates somewhere around the middle of the heated bed and is in sync with the power LED. What? Is this even fine? Some reddit posts say this is normal for a prusa, but I haven't ever heard this sound during three years of owning one.
It is also VERY well timed with the pulses I get from the motor.
https://www.youtube.com/watch?v=0nk4qrPI_9I
(Increase the volume) -
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@jay_s_uk said in Prusa upgraded to duet, weird extrusion:
@Murloc992
It's a known issue
https://blog.prusaprinters.org/dev-diary-2-how-we-made-the-heatbed-silent/It seems.. Maybe MK2.5 didn't have this.
Anyways, changed X belt to the one I found lying around, will see if this changes anything from the steel mesh belts.
