Bed vibration before each print

Is there a way to stop the vibration before each print? This is not calibration, which I do only if I move my printer physically or once in several weeks of printing. Just the loud vibration that happens about 3 to 4 seconds a few seconds before each print. Not sure which line/s in gcode does it, so I can temporarily disable it. I sometimes print parts at night, and don’t want to disturb my neighbours.

I believe that is a check to see if the frequency has changed so it can warn you.

Explain exactly what you mean by the phrase “this is not calibration” because that’s 100% exactly what it is.

While on the topic of what is and isn’t calibration, when you select to print from Bambu Studio, have you noticed the little checkbox that mentions Calibration? The box appears after you select print plate. You can’t miss it.

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The calibration check box is for filament flow/pa calibration. The vibration at the start of the print is, as stated above, to “excite” the mechanical structure to look for changes in resonances, which could be an indication that a mechanical component needs adjustment (like belt tension). Which is why there are two pulses of vibration at different frequencies.

You can’t turn it off. It’s part of the architecture of the design.

You don’t want to turn it off.

If you “mass load” the table the printer is on, that might quiet it down a little, though. A couple of heavy cinderblock pavers/tiles would do it, with the printer sitting on top of the weight sitting on top of the table.

It goes by quick enough I don’t think it’s going to be a problem for your neighbors. If it does wake them up, it’ll have stopped before they get a chance to think about it. No worse than a door slamming somewhere…

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P1P has so automatic Flow-Cal.
He means this:

Ahh thank you, I wasn’t aware disabling flow pressure advance and other calibration did not stop the resonance test.

My printer sits in a different room on a slab of solid butcher block with 4x4 cedar legs and framing in the wall to support the counter. Even in the room the dampening from the solid wood is indeed as you say, very sufficient at it’s job.

OP may want to consider moving the printer on top of a walkway paving stone or a solid counter-top/workbench.

I purchased the aftermarket soft feet from the Bambu store. They are super soft and almost spongy soft, wherein the printer moves, wobbles during the job so much so that I got worried at first that it would damage the printed parts. So far I have not made any very tall parts, but all the ones I made come out perfect.

The vibrations are travelling not via physical transmission (since I have the super soft rubber feet) but by air/soundwaves. Almost like a speaker making loud music. Not by the speaker vibrations themselves. If there is no way to stop that, Ill have to learn to live with it and hope no neighbor is getting offended.

While I am on this topic, where is the sensor/s that reads these vibrations and how does it use the vibrations to calculate the compensation while executing the gcode? A link to a more detailed discussion would also be very helpful. Meanwhile, Ill be using my good old friend google to do some research.

Yeah… I do not agree with the soft-squishy feet things. The last thing you want is the printer moving around, particularly for taller/thinner prints. They call these feet “dampers” but they’re really “isolation”. If the printer movements are exciting the surface the printer is sitting on, so it’s loud, the isolation feet will reduce the coupling between the printer and sounding board. IMO a better fix is actual “damping” and the best way to do that is with mass. The heavier the thing is that the printer is sitting on, the harder it is for the printer to excite and the less noise you should get. And the printer not moving around is only “goodness”. Putting a weight on the top of the printer could also be beneficial.

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To answer the initial question:
it should be the M970.3 and M974 commands in the 'Machine start g-code:

;===== mech mode fast check============================
G1 X128 Y128 Z10 F20000
M400 P200
M970.3 Q1 A7 B30 C80  H15 K0
M974 Q1 S2 P0

G1 X128 Y128 Z10 F20000
M400 P200
M970.3 Q0 A7 B30 C90 Q0 H15 K0
M974 Q0 S2 P0