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Accelerometer (MK4/S, MK3.9/S)

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The Input Shaper functionality on your Original Prusa MK4/S, MK3.9/S or MK3.5/S can be calibrated using an optional accelerometer. The accelerometer assembly consists of a small PCB enclosed in a printed cover, which connects to the printer. Please note that using the accelerometer requires partial disassembly of the printer.

The input shaper is pre-calibrated from factory, so this calibration is usually unnecessary on a stock printer.  However, if you've made any modifications to the printer hardware, it may be beneficial to re-calibrate the settings using the accelerometer.
Note that the use of the accelerometer is intended for experienced users only!

On MK4 and MK3.9, the accelerometer is connected directly to the dedicated port on the xBuddy board. (orange arrow in the picture below)

On MK4S and MK3.9S, you can install a short jumper cable into the xBuddy and then use the connector on the rear of the printer, as seen in the pictures below.

For MK3.5 or MK3.5S, please visit the dedicated guide.

Accelerometer connection on MK4S and MK3.9S

The accelerometer is used to calibrate the input shaper parameters. You can launch the calibration from the LCD Menu -> Settings -> Input Shaper -> Calibration

X-axis

Before proceeding with the next steps, ensure the printer is fully cooled down. 

On MK3.9 or MK4, open the fan-door completely before the procedure. Remove the silicone sock, if installed. Identify the part of the accelerometer that is in the shape of the heater block. 

Fit the accelerometer to the heater block, by pushing it from the bottom of the hotend. If there is any resistance, do not attempt to push the accelerometer harder, as excessive force might bend the heatbreak

Y-axis

Identify the part of the accelerometer that protrudes from the rest. On the front side of the Y-axis, place the protrusion between the steel sheet and the heatbed. 

Results

The results shown on the printer's display at the end of the calibration indicate the optimal input shaping type and frequency found with the calibration. 

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