I have build a lot of 3D printers. Most of them were using A4988 drivers and trust me, they were quieter than Duet which should be quieter. (because of 1/256 microstepping) I have also printer with TMC2208, so I think that loudness should be somewhere in between of these printers.

Btw. The problem is that even on idle it creates a lot of noise. It sounds like the fans are spinning but there are no fans yet. This noise is amplified when doing moves even with slow speed. And that's worrying me. When I turn spreadCycle on it's 2x times louder! I'm not a newbie in this topic I'm trying everything I can before I ask someone for help.

With settings from Marlin it sounds smoother, I would say that it is less rough.

If someone wants code to set these settings in Duet (It's for 24V PSU):
M569 P0 C66180 ; set drivers. toff 4, hstrt 0, hend 5
M569 P1 C66180 ; set drivers. toff 4, hstrt 0, hend 5
M569 P2 C66180 ; set drivers. toff 4, hstrt 0, hend 5
M569 P3 C66180 ; set drivers. toff 4, hstrt 0, hend 5
M569 P4 C66180 ; set drivers. toff 4, hstrt 0, hend 5

Values are scaled to match Marlin values.

Hi again!

The parts have come yesterday and I have rebuilded and recalibrated my extruder. Also, I have switched to relative extrusion and x128 microstepping which I think helped a bit. Here are the results:

As You can see its much better and almost perfect. Almost, because now new lines have appeared. From my research I know that it's related to stepper settings. Changing TBL and TOFF had impact on this pattern. The question is does somebody made this lines disappear on TMC2660? I know that on prusa printers they can modify stepper waveform to make it disappear, but is there a fix for us, Duet users? I'm already on 0.9 deg motor with titan Aero.

@deckingman Thanks! I remember reading this information but finally I missed it somehow. I have added S1 parameters for the test. I found it on this forum in one of the topics about the noise.

I have fixed the code and now there is a huge difference. Printing speeds are almost silent. Faster movements are still a bit loud but it's a lot better. Thank You deckingman again.

Now problem with motor hissing has remained. I will play with Toff again, maybe it will change something. If someone has some other ideas just let me know

Hi again!

The parts have come yesterday and I have rebuilded and recalibrated my extruder. Also, I have switched to relative extrusion and x128 microstepping which I think helped a bit. Here are the results:

As You can see its much better and almost perfect. Almost, because now new lines have appeared. From my research I know that it's related to stepper settings. Changing TBL and TOFF had impact on this pattern. The question is does somebody made this lines disappear on TMC2660? I know that on prusa printers they can modify stepper waveform to make it disappear, but is there a fix for us, Duet users? I'm already on 0.9 deg motor with titan Aero.

@phaedrux Idea Maker. But I was trying also Cura and S3D. Every slicer produced similar problems.

@phaedrux Yeah, it was main setting at the beginning.

@phaedrux I'm using this command M566 P1. Models on photo were printed with this setting. Sure I'm on 2.03

@sethipus My mistake, I mean S0.046 or S0.042 - I'm on direct setup Have You tried Capricorn bowden tube? It has 1.9 mm inner diameter and it's much more precisely made than standard white bowden tube. So Your system will be less flexible. I was using it above 1 year ago when I was using bowden 3D printer and it worked a bit better. But the bowden was short, about 40 cm, so on larger tube like Yours it might help You more than me.

That's the reason why I have build my printer with direct extruder. It's more accurate, less pressure problems etc.

@sethipus Thank You for professional answer. To be honest I was experimenting with pressure advance. I have been testing a few different tests to achieve best corners etc. also I was using two different tests to set proper value. If I remember right, my value for it was S0.46, or S0.42. Take a look on the last photo there are muuch thicker lines visible which excludes PA problem.

This is really good attempt but I think there is some mechanical problem with the extruder. Yesterday I have found that it was leaking and my titanium heat break was bent! :C I'm going to rebuild it with some higher quality parts from e3d which I have ordered today. Also, I will assemble it which muuuch more caution.

I will give You info guys how the results are looking after reassembling.

@phaedrux A bit. But it's not a huge difference.

@phaedrux Tried it while ago, but it looks the same. It's a bit wors where the seam is starting.

@themelle I think that reducing flow rate made amplitude of this noise smaller. But it's still there. REducing it more will give me underextrusion :X

@themelle Thanks, I will give it a try, but I think that it's not the case. I have calibrated everything (flow, e-steps etc.)