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• 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 (M906 P2).
• 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.

• New features
  • New editions: CORE One+ (Gen 2) and CORE One L+
  • Nozzle Wiper support, replacing the previous print-start nozzle cleaning routine
  • GT1.5 belts support
  • Immediate stop on filament runout
  • Guided calibration order - calibrations and tests declare their prerequisites
• Changes and improvements
  • Reorganized menus - some settings have been moved to different submenus
  • Filament compatibility checks in more places
  • Custom filament names may contain lowercase letters
• Fixes
  • Fixed not restoring original temperature on filament runout/mid-print change
  • More reliable communication with the xBuddy Extension
  • The last file in a folder was not visible, and related file list fixes
  • The printer no longer beeps on boot in Silent mode
  • An upward swipe on the touchscreen is no longer registered as a tap
  • And a lot more

Added compatibility with Gen 2

Summary

• New features
  • Support for the new Prusa XL+
  • Contactless tool offset calibration [XL+]
  • Nozzle thermal expansion compensation [XL/+]
  • Immediate stop on filament runout [6.8.1]
  • Guided calibration order [6.8.1]
  • Filament compatibility checks in more places [6.8.1]
  • Reworked tool mapping screen [6.6.0]
  • Tool mapping is preserved when reprinting a job [6.9.0]
  • Screen for unloading or changing all filaments at once [6.6.0]
  • Redesigned error screens (BSOD/RSOD) [6.5.1]
  • Crash dumps can be saved after a RSOD [6.9.0]
  • Load All and Unload All in the Filament menu [6.9.0]
  • Experimental Fast draw display mode [6.5.1]
• Changes and improvements
  • The bed moves down after finishing, pausing or stopping a print [XL/+]
  • Reorganized menus [6.8.1, 6.9.0]
  • More reliable probing and mesh bed leveling [6.6.0]
  • Spool Join now unloads the filament [6.6.0]
  • Improved filament change between different materials [6.5.7]
  • Reworked filament sensor selftest [6.5.1]
  • Calibrations and Tests can continue with a single test at a time [6.5.1]
  • Custom filament names may contain lowercase letters [6.8.1]
  • Nozzle diameters of 0.1 mm and 0.15 mm can be selected [6.5.1]
  • Side LED dimming can be set to Never, Always or Idle [6.5.0]
• Fixes
  • Fixed layer shifts during high-speed curved moves [6.5.3]
  • Fixed input shaper axis assignment [6.5.3]
  • Fixed input shaper calibration exciting the wrong axes [6.5.7]
  • Fixed a crash when printing files with more than 1024 objects [6.5.7]
  • Fixed not restoring original temperature on filament runout/mid-print change [6.8.1]
  • The last file in a folder was not visible, and related file list fixes [6.8.1]
  • The printer no longer beeps on boot in Silent mode [6.8.1]
  • An upward swipe on the touchscreen is no longer registered as a tap [6.8.1]

Summary

• New features and improvements
  • Massively speed up MMU filament changes [MMU]
  • Updated default input shaper profiles [C1+, C1L]
  • Updated translations (beta didn’t have new texts translated)
• Fixes
  • M1704 MMU load test gcode now considers toolmapping [MMU]
  • Fixed MMU sending spurious attention reports to Prusa Connect during normal toolchanges [MMU]

For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.

Summary

• New features and improvements
  • Improved filament change between different materials
• Fixes
  • Support for older xBuddy versions
  • Fixed input shaper calibration for CoreXY printers
  • Fixed not loading custom Connect certificates
  • Fixed a crash when printing more than 1024 objects

Added compatibility with Gen 2

Fixes

• Fixed not loading custom Connect certificates

New features:

• Firmware image vendor-signed to prevent a malicious 3rd-party firmware attack vector 

Fixed Bugs:

• Reduced USB filesystem privileges to eliminate a potential attack vector
• Reduced privileges of Klipper components to eliminate potential attack vectors
• Removed unused source code stubs to eliminate potential attack vectors
• Printer REST API sanitized against potential malicious code injection
• Service SSH access removed
• Printer name validation by RFC 1123 fixed

Documents:

• Security content of Prusa Pro HT90 firmware 1.3.56, Advisory ID: PSA-2026-001

• Support for Prusa Connect
• Custom print profiles
• Updated PrusaLink Web
• Exposure time limits
• Reworked handling of USB flash drives
• API key support dropped
• Other improvements
• Bug fixes
• Known issues

• Extend all timers to 255 minutes
• IPA Filtering (new feature)
• Wash cycles (new feature)
• New heating algorithm
• Automatic fans control
• Factory reset option
• Improved self-test
• Bugfixes

Summary

• New features
  • Support for the new Prusa XL+
  • Contactless tool offset calibration [XL+]
  • Nozzle thermal expansion compensation [XL/+]
  • Immediate stop on filament runout [6.8.1]
  • Guided calibration order [6.8.1]
  • Filament compatibility checks in more places [6.8.1]
  • Reworked tool mapping screen [6.6.0]
  • Tool mapping is preserved when reprinting a job [6.9.0]
  • Screen for unloading or changing all filaments at once [6.6.0]
  • Redesigned error screens (BSOD/RSOD) [6.5.1]
  • Crash dumps can be saved after a RSOD [6.9.0]
  • Load All and Unload All in the Filament menu [6.9.0]
  • Experimental Fast draw display mode [6.5.1]
• Changes and improvements
  • The bed moves down after finishing, pausing or stopping a print [XL/+]
  • Reorganized menus [6.8.1, 6.9.0]
  • More reliable probing and mesh bed leveling [6.6.0]
  • Spool Join now unloads the filament [6.6.0]
  • Improved filament change between different materials [6.5.7]
  • Reworked filament sensor selftest [6.5.1]
  • Calibrations and Tests can continue with a single test at a time [6.5.1]
  • Custom filament names may contain lowercase letters [6.8.1]
  • Nozzle diameters of 0.1 mm and 0.15 mm can be selected [6.5.1]
  • Side LED dimming can be set to Never, Always or Idle [6.5.0]
• Fixes
  • Fixed layer shifts during high-speed curved moves [6.5.3]
  • Fixed input shaper axis assignment [6.5.3]
  • Fixed input shaper calibration exciting the wrong axes [6.5.7]
  • Fixed a crash when printing files with more than 1024 objects [6.5.7]
  • Fixed not restoring original temperature on filament runout/mid-print change [6.8.1]
  • The last file in a folder was not visible, and related file list fixes [6.8.1]
  • The printer no longer beeps on boot in Silent mode [6.8.1]
  • An upward swipe on the touchscreen is no longer registered as a tap [6.8.1]

• New features
  • New editions: CORE One+ (Gen 2) and CORE One L+
  • Nozzle Wiper support, replacing the previous print-start nozzle cleaning routine
  • GT1.5 belts support
  • Immediate stop on filament runout
  • Guided calibration order - calibrations and tests declare their prerequisites
• Changes and improvements
  • Reorganized menus - some settings have been moved to different submenus
  • Filament compatibility checks in more places
  • Custom filament names may contain lowercase letters
• Fixes
  • Fixed not restoring original temperature on filament runout/mid-print change
  • More reliable communication with the xBuddy Extension
  • The last file in a folder was not visible, and related file list fixes
  • The printer no longer beeps on boot in Silent mode
  • An upward swipe on the touchscreen is no longer registered as a tap
  • And a lot more

Added compatibility with Gen 2

Summary

• New features and improvements
  • Improved filament change between different materials
• Fixes
  • Support for older xBuddy versions
  • Fixed input shaper calibration for CoreXY printers
  • Fixed not loading custom Connect certificates
  • Fixed a crash when printing more than 1024 objects

Summary

• New features and improvements
  • Improved filament change between different materials
• Fixes
  • Support for older xBuddy versions
  • Fixed input shaper calibration for CoreXY printers
  • Fixed not loading custom Connect certificates
  • Fixed a crash when printing more than 1024 objects

Summary

• New features and improvements
  • Improved filament change between different materials
• Fixes
  • Support for older xBuddy versions
  • Fixed input shaper calibration for CoreXY printers
  • Fixed not loading custom Connect certificates
  • Fixed a crash when printing more than 1024 objects

Summary

• New features and improvements
  • Improved filament change between different materials
• Fixes
  • Support for older xBuddy versions
  • Fixed input shaper calibration for CoreXY printers
  • Fixed not loading custom Connect certificates
  • Fixed a crash when printing more than 1024 objects

Summary

• New features and improvements
  • Improved filament change between different materials
• Fixes
  • Support for older xBuddy versions
  • Fixed input shaper calibration for CoreXY printers
  • Fixed not loading custom Connect certificates
  • Fixed a crash when printing more than 1024 objects

• Add filament presence check at start of print
• Region Mesh Bed Levelling fixes
• Show filament color/name during M600
• Fix safety timer not handled correctly
• Delay Z-Axis on Autoload
• Replace hard coded crash z lift value with Pause Z lift value.
• Send host actions on filament runout
• Lower MIN_Z_FOR_UNLOAD from 50mm to 20mm
• Add "load filament" if autoload is disabled
• Abort nozzle change if filament is loaded
• PowerPanic related changes
• Reduce ambient shutdown to 80 °C
• Added utils/build.py to be able to compile the firmware
• MMU related changes
• Minor fixes
• Community related changes

• Add filament presence check at start of print
• Region Mesh Bed Levelling fixes
• Show filament color/name during M600
• Fix safety timer not handled correctly
• Delay Z-Axis on Autoload
• Replace hard coded crash z lift value with Pause Z lift value.
• Send host actions on filament runout
• Lower MIN_Z_FOR_UNLOAD from 50mm to 20mm
• Add "load filament" if autoload is disabled
• Abort nozzle change if filament is loaded
• PowerPanic related changes
• Reduce ambient shutdown to 80 °C
• Added utils/build.py to be able to compile the firmware
• MMU related changes
• Minor fixes
• Community related changes

Fixes

• Fixed not loading custom Connect certificates

• Add filament presence check at start of print
• Region Mesh Bed Levelling fixes
• Show filament color/name during M600
• Fix safety timer not handled correctly
• Delay Z-Axis on Autoload
• Replace hard coded crash z lift value with Pause Z lift value.
• Send host actions on filament runout
• Lower MIN_Z_FOR_UNLOAD from 50mm to 20mm
• Add "load filament" if autoload is disabled
• Abort nozzle change if filament is loaded
• PowerPanic related changes
• Reduce ambient shutdown to 80 °C
• Added utils/build.py to be able to compile the firmware
• MMU related changes
• Minor fixes
• Community related changes

• Support for Prusa Connect
• Custom print profiles
• Updated PrusaLink Web
• Exposure time limits
• Reworked handling of USB flash drives
• API key support dropped
• Other improvements
• Bug fixes
• Known issues

• Add filament presence check at start of print
• Region Mesh Bed Levelling fixes
• Show filament color/name during M600
• Fix safety timer not handled correctly
• Delay Z-Axis on Autoload
• Replace hard coded crash z lift value with Pause Z lift value.
• Send host actions on filament runout
• Lower MIN_Z_FOR_UNLOAD from 50mm to 20mm
• Add "load filament" if autoload is disabled
• Abort nozzle change if filament is loaded
• PowerPanic related changes
• Reduce ambient shutdown to 80 °C
• Added utils/build.py to be able to compile the firmware
• MMU related changes
• Minor fixes
• Community related changes

• Extend all timers to 255 minutes
• IPA Filtering (new feature)
• Wash cycles (new feature)
• New heating algorithm
• Automatic fans control
• Factory reset option
• Improved self-test
• Bugfixes

• Add filament presence check at start of print
• Region Mesh Bed Levelling fixes
• Show filament color/name during M600
• Fix safety timer not handled correctly
• Delay Z-Axis on Autoload
• Replace hard coded crash z lift value with Pause Z lift value.
• Send host actions on filament runout
• Lower MIN_Z_FOR_UNLOAD from 50mm to 20mm
• Add "load filament" if autoload is disabled
• Abort nozzle change if filament is loaded
• PowerPanic related changes
• Reduce ambient shutdown to 80 °C
• Added utils/build.py to be able to compile the firmware
• MMU related changes
• Minor fixes
• Community related changes

• Add filament presence check at start of print
• Region Mesh Bed Levelling fixes
• Show filament color/name during M600
• Fix safety timer not handled correctly
• Delay Z-Axis on Autoload
• Replace hard coded crash z lift value with Pause Z lift value.
• Send host actions on filament runout
• Lower MIN_Z_FOR_UNLOAD from 50mm to 20mm
• Add "load filament" if autoload is disabled
• Abort nozzle change if filament is loaded
• PowerPanic related changes
• Reduce ambient shutdown to 80 °C
• Added utils/build.py to be able to compile the firmware
• MMU related changes
• Minor fixes
• Community related changes

• Preheat error improved
• Improved temperature regulation
• Remaining time estimation
• Adjustable beeper notifications
• Incomplete file check updated
• G-code fixes (M27, M110, M115)

• Preheat error improved
• Improved temperature regulation
• Remaining time estimation
• Adjustable beeper notifications
• Incomplete file check updated
• G-code fixes (M27, M110, M115)

• Improved XYZ calibration
• XYZ calibration results are now available in Support menu
• Selftest fixed
• Improved unload filament
• Multi Material
• When stopping a print, user is asked what filaments to unload
• “T?” Gcode added, which selects extruder to use prior to the print
• Added support for MK1