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Prusa CORE One/+ INDX Changelog

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Version 6.6.3

20.07.2026

Summary

  • Improvements
    • Improved head LED behavior by synchronizing tool LEDs with the printer state and matching the status indication used by the heated bed LEDs.
    • Added Nozzle Cleaner Y Offset adjustment to the Tune menu for easier calibration directly from the printer interface.
    • Added ringdown decay information to the Sensor Info screen for improved diagnostics and troubleshooting.
    • Improved synchronization of loadcell samples between the toolhead and xBuddy, increasing the robustness of probing and calibration procedures.
    • Optimized motion step calculations to reduce the risk of layer shifts during printing.
    • Streamlined hotend management logic to improve maintainability and reliability.
    • Reduced calibration time by skipping temperature residency during tool offset calibration heating.
  • Fixes
    • Reworked nozzle heater self-test validation to use thermal model evaluation during heating, reducing false self-test failures caused by minor deviations in heating performance.
    • Added validation of INDX coil current during heater self-tests to detect abnormal nozzle behavior.
    • Updated INDX nozzle thermal diagnostics to leverage thermal protection results for more accurate fault detection.
    • Fixed an issue where hotend thermal errors could be reported even when no nozzle was installed by verifying nozzle presence before triggering errors.
    • Fixed the Tool Change button incorrectly opening the extruded filament submenu.
    • Fixed an issue where an uninitialized nozzle temperature was displayed as 15 °C in the footer.
    • Removed a redundant cooldown check from the nozzle cleaner calibration process.

Version 6.6.2

10.07.2026

Improvements

  • Adjusted the nozzle cleaner origin position and fixed handling of nozzle cleaner offsets during parking moves.
  • EEPROM-stored nozzle cleaner offsets are now automatically adjusted after the update, eliminating the need for nozzle cleaner recalibration.
  • Adjusted the tool lock move distance for improved tool pickup reliability and reduced risk of filament being unintentionally ejected from the extruder gears.
  • Added a new option in the Tune menu for fine-tuning the nozzle cleaner X offset.

Fixes

  • Fixed bumping into the waste bin after an MBL failure.
  • Fixed an issue requiring tool removal during Dock Calibration even when no tool was loaded in the head.
  • Fixed support for older xBuddy revisions with inverted pins (early MK4 converted boards). (Credit: ScottKolo)
  • Fixed selftest gray buttons not updating after dependencies were met.
  • Fixed incorrect feedrate when loading PLA after FLEX material.
  • Fixed an invisible Abort button on the Y-axis Input Shaper selftest screen.
  • Fixed Tool Offset Cyphal communication not being reinitialized after board reset.

Version 6.6.1

02.07.2026
  • Improvements
    • Lower the print bed when a tool is unknown or lost, allowing the user to safely remove the print.
    • During Dock Calibration, users can now choose between KeepCalibrate, and Invalidate.
    • Added an  flag to skip temperature stabilization.
  • Fixes
    • Fixed spontaneous INDX Head resets.
    • Fixed incorrect tool assignment after a REDSCREEN reset. The printer now saves the currently selected tool.
    • Removed the extruder filament sensor from the footer and the Sensor Info menu.

Version 6.6.0

25.06.2026

Summary

  • New features and improvements
    • First firmware release for the Prusa CORE One/+ INDX
    • Full INDX toolchanger support, with automatic tool changes for up to 8 tools
    • Contactless nozzle induction heating
    • Continuous nozzle presence detection for safety and fault detection
    • Contactless tool offset sensor
    • Guided INDX calibrations: docks, tool offsets, nozzle cleaner, and more
    • Automatic, low-waste nozzle cleaning with a wastebin
    • Screen for unloading or changing all filaments at once
    • Reworked tool mapping screen supporting up to 8 tools
    • Empty Nozzle Cleaner
  • Known issues
    • Pick / park failures
    • Parking in an occupied dock
    • Single-tool auto-load
    • Flexible materials
    • Special materials
    • Spontaneous INDX Head resets
    • Phase Stepping & Input Shaper calibrations
    • Filament stuck detection