First print after upgrading to Duet3d WiFi

briskspirit

@dc42 any ideas where to dig? Please!

Danal

@briskspirit said in First print after upgrading to Duet3d WiFi:

Or could it be because my belts might be overtightened ? (Sounds like a guitar strings)

I don't know if being too tight causes ringing per se... but it does cause all kinds of other bad things.

"Tight, but not too tight." Yeah, what a load of... anyway... "Guitar string" is definitely too tight. IMNSHO.

dc42

@briskspirit said in First print after upgrading to Duet3d WiFi:

X axis: nema 17 40mm 0.9deg stepper with current set at 80%, Y axis nema 17 40mm 1.8deg high impedance stepper with current set at 80%
...
; Steppers currents

M906 X1064 Y680 Z1200 E714:714 I30 ; Set motor currents (mA) and motor idle factor in per cent

Which motors, exactly? Are you using 12V or 24V power? Your Y axis motor in particular almost certainly needs 24V power, and even then the maximum speed before it loses torque and becomes noisy is likely to be quite low.

briskspirit

@dc42 24V power supply, max speed and acceleration was calculated from your online tools

X stepper JK42HM34-1334
Y stepper 42HB34F08AB-10

briskspirit

@dc42 I saw your answer in topic https://forum.duet3d.com/topic/8223/extruder-smoothness/2

I am using 1.8deg steppers on both extruders with steps per mm = ~100. (X16 microstepping, I1)
Maybe this is what is going on too?
I have two pancake motors with 0.9deg, but they are short/less powerful (waiting for gears to come)

dc42

Is the ringing pattern worse on the X face of the cube, or on the Y face? Whichever face is worse, it's probably the other axis that is ringing.

briskspirit

@dc42 Both axis has that ringing with same period but amplitude is worser on the Y face(so X is ringing with more amplitude)

briskspirit

What can cause almost the same ringing?

briskspirit

So I was a bit angry and furious and crashed my printer )) Some 8mm rods got bent and etc... Long story short: rebuilt my printer with new rods, installed dampers for Y and Z, tightened everything and now at 42mm/s speed I am getting very minimal ringing with very small amplitude(can see barely but can't feel by nail). So rebuilding helped or dampers

dc42

I'm glad you solved it.

The major cause of low-frequency ringing on a well-built machine is likely to be the interaction of the elasticity of the belts and the moving mass. That's why it's generally helpful to keep the moving mass as low as possible.