Prusa upgraded to duet, weird extrusion
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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.
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I dont think its the belts as otherwise the artifacts would be vertical and not on an angle, and definitely not changing with the size of the cube.
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steel belts and 16 tooth pulleys that do a 180 degree directional change do not play well together.
if not now it will prevent headache in the future. -
@NitroFreak said in Prusa upgraded to duet, weird extrusion:
I dont think its the belts as otherwise the artifacts would be vertical and not on an angle, and definitely not changing with the size of the cube...
Did you go through the prusa thread about the 0.9 degree steppers yet?Not yet, it's a large post. I hope to do it today maybe.
Just not sure what else to try at the moment. I could try using a bearing idler to be honest, just to see if I get some kind of wobble from the idling and the noise is just a placebo kind of thing.
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Looking back, are your e steps per mm 276 still? I think they should be around 410 for BMG with 1.8 degree motors, and higher for 0.9. This might mean the filament isn’t running in the hobbed part of the gear. This would force the two hobbed shafts further apart, far enough for the gears on the shafts to mesh poorly, and give poor extrusion. Is there any chance you’ve assembled the extruder incorrectly? Feel free to post pictures!
Swapping out the extruder drive for your old one might also me an option, if it fits the Bear setup.
Ian
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@droftarts said in Prusa upgraded to duet, weird extrusion:
Looking back, are your e steps per mm 276 still? I think they should be around 410 for BMG with 1.8 degree motors,
its a prusa. so no 3:1 reduction. thats just the normal around 100 something increased by the 0.9 stepper.
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@Veti Ah yes, of course. Might still be strange meshing of the two filament drive gears, though.
Ian
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@Veti said in Prusa upgraded to duet, weird extrusion:
@droftarts said in Prusa upgraded to duet, weird extrusion:
Looking back, are your e steps per mm 276 still? I think they should be around 410 for BMG with 1.8 degree motors,its a prusa. so no 3:1 reduction. thats just the normal around 100 something increased by the 0.9 stepper.
If to be completely accurate: 133 default, 138 after calibration with 1.8' motor. 276 with 0.9' motor. Steps are spot on.
@droftarts said in Prusa upgraded to duet, weird extrusion:
Is there any chance you’ve assembled the extruder incorrectly? Feel free to post pictures!
Not a chance. I've owned this printer for several(3+) years by now. Went through MK2.5S, MK2.5X(custom), MK3 "hybrid"(adapted for 2.5), bear extruder. Never assembled it wrong.
Here's how my filament is going through the main bondtech gear:
@droftarts said in Prusa upgraded to duet, weird extrusion:
@Veti Ah yes, of course. Might still be strange meshing of the two filament drive gears, though.
Ian
Meshing seems fine, but I will try putting in 623 bearing idler after I customize it.
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I know what it might be. In the Prusa bear thread they talked about how the 0.9 might not have enough torque to direct drive the extruder.
I just read that you‘re using the 12v PS.
0.9 degree steppers really want 24v otherwise you will not be able to reach good speeds and torque, because you literally only have half the torque vs 24v and torque is further halved because you have the 0.9 instead of a 1.8 stepper. I could imagine the extruder is lacking until it reaches the next full step where it snaps to, resulting in this sort of extrusion inconsistency.I would suggest you try a 24v power supply
