Prusa CORE One/+ INDX Changelog

• New features
  • New Edition: C1+ (Gen 2) → INDX Conversion Support - Added support for converting the C1+ Gen 2 to INDX, including belt switching.
  • GT1.5 Belts - Added support for GT1.5 belts.
  • Expansion Joints Gen 2 - Added support for Expansion Joints Gen 2, featuring a significantly shorter heat-absorption phase on CORE One+ (Gen 2).
  • Automatic Nozzle Cleaner Calibration - Added automatic calibration of the nozzle cleaner.
  • Load All / Unload All - Added Load All and Unload All options to the Filament menu.
  • Filament Sensor Calibration - Added filament sensor calibration and improved handling of the “Not connected” state.
  • Crash Dump Saving - Added the option to save crash dumps after a Red Screen event via Settings > System > Save Crash Dump. Crash dumps can help diagnose and debug user-reported issues.
  • FLEX Material Current Profile - Added a dedicated current profile for FLEX materials ().
• Improvements and Changes
  • Print State Bed Position - The bed now moves down after Empty Waste Bin, and when pausing, stopping, or finishing a print.
  • Tool Mapping Persistence - Tool mapping is now preserved when reprinting a job.
  • Chamber Grid - The chamber grid now closes automatically after a print is completed.
  • INDX Head LED Dimming - INDX head LEDs now dim together with the chamber light.
  • Menu Reorganization - Reorganized the menu structure for improved usability.
  • Nozzle Cleaner Resume - The nozzle is reheated in the nozzle cleaner when resuming a print.
  • Purge Point - Adjusted the purge point by +0.5 mm in Y.
  • INDX Nozzle Presence Detection - Relaxed the upper threshold for nozzle presence detection to improve detection reliability.
  • Ringdown Decay - Adjusted the "nozzle presence" decay treshold from 0.095 to 0.085.
• Fixes
  • Incorrect Temperature After Runout - Fixed an issue causing an incorrect nozzle temperature to be displayed after a filament runout.
  • Auto-Retract with Cold Nozzle - Fixed an issue where auto-retraction could be triggered with a cold nozzle.
  • Bed Position After Print State Changes - Fixed cases where the bed did not move to the expected position after pausing, stopping, or completing a print.

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.

• 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.

• 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 Keep, Calibrate, 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.

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