Help please to understand these waves on my prints

[briskspirit]

Hello everyone.

I have strange waves when printing wall calibration cube and other straight walls. They are on X and Y axis and I can't understand where are they from.

I think this is not from Z wobble but more like extruder pulsations? (Printing speed 10mm/s, PLA and PETG, no infill!)

[Phaedrux]

Can you post your config.g?

What microstepping are you using?

What kind of extruder is it? Are the gears clean?

Does it look like it's pausing or anything while printing? Does it sound different?

Does it persist if you print faster?

[briskspirit]

@phaedrux Sorry , forgot to mention that I am not yet switched to Duet (waiting for Maestro) and right now I am on Chitu3D v4.2 with closed source firmware, extruder is direct drive Mk10. Same is happening from both extruders and what you see at photos is with Extruder Multiplier set to 100%, now I set 91% as per my measurements and getting even more same waves(less pitch). Extruders are calibrated with right steps per mm. Gears are clean(this is my first print from the left extruder with PETG, same is on my right with PLA). And there is no grinding or skipping steps noise.

I am not sure about if it persists when I print faster but as I remember - no(will try)

So as extruder is new, calibrated and etc - seems like firmware/stepper fault?

[Phaedrux]

@briskspirit said in Help please to understand these waves on my prints:

Chitu3D

In that case I'm not sure what to try.

[briskspirit]

@phaedrux Thank you anyway! Very soon I will be in your club

[RCarlyle]

@briskspirit to check for extruder issues, scale the box up or down by 5% and reprint to see if the angle of the lines changes. Or print a Benchy or something that won’t show a pattern at all if the issue is extruder flow.

[briskspirit]

@rcarlyle On Benchy I don't see any pattern but surface is not ideal.

[dc42]

If you turn down the extrusion factor by 10% in DWC, does the horizontal spacing of the pattern increase by a factor of 10/9 ?

[briskspirit]

@dc42 I have changed extrusion multiplier from 100% to 91% and now I see more waves(pitch is smaller between these waves). So as I've understood your question - no, spacing of the pattern is decreased.

[dc42]

@briskspirit, that's odd. Is it the exact same GCode file? I think it's an extruder problem; but if it happens once every X mm of filament consumed, then reducing the extrusion rate should have increased the wavelength.