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Last updated 3 months ago
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Prusa printers are well known for being very silent, even in the standard mode. But actually, our printers also offer an option for even quieter operation. In the instructions below you will learn how to set your printer to stealth mode

MK4, MK3.9, MK3.5, XL, MINI/+

Starting from firmware versions 6.0.0 and above, two print modes are offered on the Original MK4, MK3.9, MK3.5, XL, and MINI/+. This is set by toggling the Stealth Mode. In idle mode, navigate to LCD menu -> Settings

It is also possible to switch between Normal and Stealth mode during a print. In this case, navigate to LCD menu -> Tune. In this case, the selected mode will be activated once several G-code commands in the buffer (printer memory) are processed. 

Once the stealth mode is enabled, the firmware sets a limit to acceleration, feedrate, and jerk values. Setting a cap on these parameters will lower the noise. The trade-off is an increased print time. 

Screenshot from the Original Prusa MK4

MK3 and MK3S

Normal vs. Stealth mode

MK3 series printers offer two print modes. Normal mode is required for the detection of lost steps (shifted layers), while still being quieter than the silent mode on MK2/S. There is also the Stealth mode, which utilizes Trinamic StealthChop technology. This makes the printer almost inaudible where the print cooling fan is the noisiest part of the printer.

Stealth mode does not provide Crash detection (lost steps cannot be detected).

These modes can be switched depending on the situation:

  1. When idle:

    LCD Menu -> Settings -> [Normal / Stealth mode]

  2. During a print:

    LCD Menu -> Tune -> [Normal / Stealth mode]

MK2/S, MK2.5 and MK2.5S

Power vs. Silent mode

The silent mode uses less current and makes the printer quieter but less powerful. Hi-power mode is great for very large (over 200 gram) prints. It is also recommended for newly assembled kits before you fine-tune everything. If you experience lost steps (shifted layers) or if you’re manually adjusting the speed of printing to more than 100%, use Hi-power mode.

Auto power mode

There is also an Auto Power Mode. This is basically a compromise between silent and hi-power modes. The stepper currents depend on the Z height. The current starts low when the Z height is minimal. And it increases slowly as the object is printed. 

These modes can be changed in two ways:

  1. When idle:

    LCD Menu -> Settings -> [Hi-power mode / Silent mode / Auto power mode]

  2. During a print:

    LCD Menu -> Tune -> [Hi-power mode / Silent mode / Auto power mode]

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