Prusa error 13323 (Accelerometer Communication Failed) appears on the MK4 and its equivalents are #31323 on the CORE One, #35323 on the CORE One L, #26323 on the MK4S, #27323 on the MK3.9S, and #21323 on the MK3.9. The printer cannot establish communication with the accelerometer sensor used for Input Shaper vibration calibration.

What the Error Means

Prusa MK4-family printers include an accelerometer that enables Input Shaper — a resonance compensation algorithm that reduces print ringing (ghosting) artifacts at higher speeds. When this error appears, the Buddy board cannot read the accelerometer over its communication bus, preventing Input Shaper calibration from running. The accelerometer board is connected via a dedicated cable, and on some models shares the same mounting bracket as the Wi-Fi module. The fault is almost always a loose or damaged cable connector rather than a failed accelerometer board.

Step-by-Step Fix

1. Power off the printer. Always work on internal connectors with power off.
2. Locate the accelerometer board and its cable. The accelerometer is typically a small PCB mounted near the printhead assembly or on the X carriage. Trace the cable from the accelerometer to its connector on the xBuddy board.
3. Inspect both ends of the accelerometer cable. Unplug and firmly reseat the connector at the accelerometer board and at the xBuddy board. Check the cable for kinks, cuts, or connector damage along its routing path.
4. Check the Wi-Fi module connector on the same assembly. On models where the accelerometer and Wi-Fi module share the same bracket or cable run, ensure the Wi-Fi module connector is also fully seated — a displaced connector nearby can affect the shared cable harness.
5. Reconnect all loose connectors on the xBuddy board. While you have the enclosure open, inspect all small board connectors for any that are partially pulled out.
6. Test Input Shaper calibration after reconnecting. Power on and run LCD Menu → Calibrations & tests → Input Shaper (if available for your model) to confirm communication is restored.

Parts Required

• No replacement parts are typically required for this fix — basic tools only
• Replacement accelerometer board (if the cable is intact but the board does not respond — contact Prusa Support)

If the cable is intact and properly connected but the error persists, contact Prusa Support at help.prusa3d.com for assistance with the accelerometer board replacement.

Frequently asked questions

What does Prusa 13323 mean?

Prusa error 13323 (Accelerometer Communication Failed) appears on the MK4 and its equivalents are #31323 on the CORE One, #35323 on the CORE One L, #26323 on the MK4S, #27323 on the MK3.9S, and #21323 on the MK3.9. The printer cannot establish communication with the accelerometer sensor used for Input Shaper vibration calibration.

How do I fix Prusa 13323?

Prusa error 13323 means the printer cannot communicate with the accelerometer for Input Shaper. Learn how to check the cable, connectors, and reseat the accelerometer board.