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Accelerometer

(CORE One, MK4/S, MK3.9/S)

Relevant for

MK4
MK3.9
MK3.5
MK4S
MK3.9S
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The Input Shaper functionality on the Prusa CORE One, and on the Original Prusa MK4/S, MK3.9/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 the 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 recalibrate the settings using the accelerometer. 

 

On Prusa CORE One, remove the circular cover on the back. Then, route the accelerometer cable in the hole. 

Connect the accelerometer cable to the connector at the back of the printer. 

On MK4S and MK3.9S, connect the accelerometer to the dedicated port on the xBuddy board
Alternatively, you can install a short jumper cable between the xBuddy and the Wi-Fi module on the back of the printer. Then, you can connect the accelerometer to the connector on the back of the printer

On MK4 and MK3.9, connect the cable to the accelerometer's PCB and attach the printed covers. The accelerometer connects directly to the dedicated port on the xBuddy board

Without the jumper cable, the connector on the rear of the printer provides no functionality.

Accelerometer connection on MK4S and MK3.9S

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

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 (MK4/S, MK3.9/S, MK3.5/S)

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.