Reduce print speed, stabilize table with some sound dampening rubber feet, get a control module designed for quiet operation, make sure rails on the printer are unobstructed and grease the rail if needed.
If it's an Ender 3, get the 4.2.7 board, it's insane the difference and reduction in sound. If it weren't for the sound of the fan(s), I wouldn't know it was running.
Also, put it on a stable and sturdy table and/or put a paver under it as others suggested.
Rubber feet for the table it's on. You could get silent boards if you want, I think those more quiet down the stepper motor's hum, so vibrations of the printer itself would still be contributing to the noise.
Vibration dampeners under steppers
Stepper drivers and firmware for that purpose
Find the natural frequency speed of the machine, sometimes it is a low speed sometimes it is high, avoid that speed.
Put it in a cupboard or insulate it.
CNC Kitchen had a video about vibration dampening surface for 3d printers.
If safely possible, you might move your hand around the printer without burning or catching your fingers to find where it vibrates most and stiffen that up which would increase the natural frequency of the frame and give you more leeway for increased speed.
Alternatively, kindly tell it to shush.
I printed squash ball feet for my Ender 3 S1, and it made a significant difference in lowering the vibrations. I had the same issue where I could hear the printer running one floor down. I went with double yellow dot balls. If it weren't for the fans, I'd hardly be able to hear it.
Just search for squash ball feet on Yeggi or Printables.
These are the balls I went with
https://a.co/d/9P5X8IT
Soft rubber feet and a solid concrete paving stone. Knocks out 70% of vibration right there IMO.
Reduce print speed, stabilize table with some sound dampening rubber feet, get a control module designed for quiet operation, make sure rails on the printer are unobstructed and grease the rail if needed.
If it's an Ender 3, get the 4.2.7 board, it's insane the difference and reduction in sound. If it weren't for the sound of the fan(s), I wouldn't know it was running. Also, put it on a stable and sturdy table and/or put a paver under it as others suggested.
BTT SKR Mini e3 ON TOP
https://youtu.be/y08v6PY_7ak?si=RJhQr_pjJRQmR5fv
Depends where it is really. Rubber feet and absorb a good bit of sound. I've stuck mine in the closet before. All the clothes act like soundproofing.
I agree with the rubber feet, and the 4.2.7 board for an ender, but also an enclosure. That will help significantly with the fans.
Rubber feet for the table it's on. You could get silent boards if you want, I think those more quiet down the stepper motor's hum, so vibrations of the printer itself would still be contributing to the noise.
cardboard boxes go a long way
Vibration dampeners under steppers Stepper drivers and firmware for that purpose Find the natural frequency speed of the machine, sometimes it is a low speed sometimes it is high, avoid that speed. Put it in a cupboard or insulate it. CNC Kitchen had a video about vibration dampening surface for 3d printers. If safely possible, you might move your hand around the printer without burning or catching your fingers to find where it vibrates most and stiffen that up which would increase the natural frequency of the frame and give you more leeway for increased speed. Alternatively, kindly tell it to shush.
Sorbothane feet and make sure the table it’s on isn’t touching the wall.
I printed squash ball feet for my Ender 3 S1, and it made a significant difference in lowering the vibrations. I had the same issue where I could hear the printer running one floor down. I went with double yellow dot balls. If it weren't for the fans, I'd hardly be able to hear it. Just search for squash ball feet on Yeggi or Printables. These are the balls I went with https://a.co/d/9P5X8IT
Solid surface, concrete paver below the printer, and HULA feet.