Prusa upgraded to duet, weird extrusion

[T3P3Tony]

@Murloc992 yes remap as you like. Also another option for this test you can connect two Z in series to the Z motor connector

[Murloc992]

@T3P3Tony I am printing another single wall cube and notice something new with new acceleration/jerk settings. I will post soon. I still hear the pulsing though, but it looks a bit different than before.

[Murloc992]

X Axis:

Y Axis:

As you can see, increasing the settings(speeds, acceleration) made the pattern reversed(of all the things) and more intense.

[T3P3Tony]

@Murloc992 what about rotation by 45degrees?

[Murloc992]

@T3P3Tony

Let me try.

[Murloc992]

Original cube on the left, the 45 degree rotated on the right:

[Phaedrux]

It's gotta be the new extruder motor. Perhaps it came bad from E3D?

[Murloc992]

@Phaedrux

I tried the X and Y motors instead of it, all the same..

[Murloc992]

Could it be belts? I changed mine to spring steel mesh belts(because I didn't have any others), I will buy proper (normal) gt2 belts tomorrow.

But I think with belts I would have perimeter patterns, matching the tooth spacing..

[Phaedrux]

@Murloc992 said in Prusa upgraded to duet, weird extrusion:

spring steel mesh belts

That might explain the excessive ringing shown on the other models, but I don't think it explains the diagonal pattern on the cubes.

[Murloc992]

@Phaedrux

The primeter walls seem to be perfect when looked from above though.

Now that I zoomed the picture in, it seems microscopically blobby..?

[Phaedrux]

Were you able to test a different driver yet?

[Murloc992]

@Phaedrux

I will right now.

[Murloc992]

Same..

The light is non uniform but all of them look semi identical.

Left to right: the original one, 45 degree, 45 degree + swapped driver

I made a video while printing this one:

Raise your volume a lot to hear the pulsing:
https://www.youtube.com/watch?v=wpG9eKp1ytA

I 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.

[droftarts]

@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

[Murloc992]

@droftarts

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.

[NitroFreak]

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?

[Murloc992]

@NitroFreak

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..

[T3P3Tony]

@Murloc992 do you get the pulsing on extrusion with just extrusion not printing?

[Murloc992]

@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.