Firmware & Downloads
PrusaSlicer 2.9.4
November 07, 2025
Changes in 2.9.4
- Junction Deviation Integration
- Improved Time Estimation
Firmware 6.5.3
March 23, 2026
Changes in 6.5.3
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Firmware 6.5.3
March 24, 2026
Changes in 6.5.3
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Firmware 6.5.3
March 24, 2026
Changes in 6.5.3
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Handbook 1.01
February 25, 2025
Changes in 1.01
- Instructions for installing anti-vibration bars
Firmware 6.5.3
March 23, 2026
Changes in 6.5.3
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Handbook 1.01
October 23, 2024
Changes in 1.01
Correction of product information
Minor content updates
Firmware Firmware 6.5.3 (3.0.4) CORE One L
March 23, 2026
Changes in Firmware 6.5.3 (3.0.4) CORE One L
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Firmware Firmware 6.5.3 (3.0.4) CORE One/CORE One+
March 23, 2026
Changes in Firmware 6.5.3 (3.0.4) CORE One/CORE One+
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Firmware Firmware 6.5.3 (3.0.4) MK4S, MK4, MK3.9S, MK3.9
March 23, 2026
Changes in Firmware 6.5.3 (3.0.4) MK4S, MK4, MK3.9S, MK3.9
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Firmware 6.4.0 (3.0.3) CORE One
November 25, 2025
Changes in 6.4.0 (3.0.3) CORE One
Firmware 6.4.0 (3.0.3) MK3.5S, MK3.5
November 25, 2025
Changes in 6.4.0 (3.0.3) MK3.5S, MK3.5
- New features
- Automatic chamber vent opening/closing (C1/+)
- Belt tuning wizard (C1/+)
- Faster and more responsive Prusa Connect experience
- Nozzle cleaning failed wizard
- Auto-retract (MK4 family, XL)
- Auto-retract improvements (C1/+)
- Auto-retract disable option (C1/+)
- Selective factory reset
- Chamber support for backwards G-Code compatibility (C1/+)
- Changes and improvements
- Improved print status messages
- Lazier homing, more cautious calibration
- Autoload improvements
- Unified XL & CORE One chamber filtration
- Option to continue after nozzle cleaning failure
- Print sheet detection (MK4 family)
- Respect maximum printed Z position
- Gearbox alignment calibration (XL)
- Filament change from Tune menu in any tool (XL)
- Support cancelling more objects
- Wi-Fi signal strength indicator
- BSOD knob press behavior
- Reworked filament sensor evaluation
- Ukrainian language support for all printers
- Fixes
- All the fixes from the 6.3.X releases have been expanded to other printers.
- Various fixes and stability improvements
Firmware 6.4.0 (3.0.3) MK4S, MK4, MK3.9S, MK3.9
November 25, 2025
Changes in 6.4.0 (3.0.3) MK4S, MK4, MK3.9S, MK3.9
- New features
- Automatic chamber vent opening/closing (C1/+)
- Belt tuning wizard (C1/+)
- Faster and more responsive Prusa Connect experience
- Nozzle cleaning failed wizard
- Auto-retract (MK4 family, XL)
- Auto-retract improvements (C1/+)
- Auto-retract disable option (C1/+)
- Selective factory reset
- Chamber support for backwards G-Code compatibility (C1/+)
- Changes and improvements
- Improved print status messages
- Lazier homing, more cautious calibration
- Autoload improvements
- Unified XL & CORE One chamber filtration
- Option to continue after nozzle cleaning failure
- Print sheet detection (MK4 family)
- Respect maximum printed Z position
- Gearbox alignment calibration (XL)
- Filament change from Tune menu in any tool (XL)
- Support cancelling more objects
- Wi-Fi signal strength indicator
- BSOD knob press behavior
- Reworked filament sensor evaluation
- Ukrainian language support for all printers
- Fixes
- All the fixes from the 6.3.X releases have been expanded to other printers.
- Various fixes and stability improvements
Firmware 6.2.6 (3.0.3) MK3.5S, MK3.5
September 03, 2025
Changes in 6.2.6 (3.0.3) MK3.5S, MK3.5
Summary
- Display refresh rate fallback to improve stability
- Fixes for rare BSOD crashes during filament handling
Firmware 6.2.6 (3.0.3) MK4S, MK4, MK3.9S, MK3.9
September 03, 2025
Changes in 6.2.6 (3.0.3) MK4S, MK4, MK3.9S, MK3.9
Summary
- Display refresh rate fallback to improve stability
- Fixes for rare BSOD crashes during filament handling
Firmware 6.3.4 (3.0.3) CORE One
July 17, 2025
Changes in 6.3.4 (3.0.3) CORE One
- Smarter heat absorption logic
- Retuned heatbed PID for thermal stability
- Automatic display refresh rate fallback
- Additional updates, improvements, and fixes
Handbook 1.03
June 05, 2025
Changes in 1.03
- Includes instructions for Prusa CORE One
- Added instructions for initial setup
Firmware 6.2.6
September 03, 2025
Changes in 6.2.6
Summary
- Display refresh rate fallback to improve stability
- Reduced sensitivity to bed heating fluctuations on XL
- Fixes for rare BSOD crashes during filament handling
Handbook 1.05
August 21, 2025
Changes in 1.05
- Updated information about Prusa Connect and Prusa App
- Updated description of package contents and selftest duration
- Updated instructions for loading filament with multiple tools
Firmware 1.3.19
September 30, 2025
Changes in 1.3.19
New features:
- Linear rails maintenance interval check
Fixed bugs:
- Prusa Connect print thumbnail display fix
Handbook 1.01
May 05, 2025
Changes in 1.01
- Updated specification of OHS (Occupational Health and Safety)
- Updated description of package contents
- Updated maintenance section
Firmware 6.4.0
November 25, 2025
Changes in 6.4.0
- New features
- Automatic chamber vent opening/closing (C1/+)
- Belt tuning wizard (C1/+)
- Faster and more responsive Prusa Connect experience
- Nozzle cleaning failed wizard
- Auto-retract (MK4 family, XL)
- Auto-retract improvements (C1/+)
- Auto-retract disable option (C1/+)
- Selective factory reset
- Chamber support for backwards G-Code compatibility (C1/+)
- Changes and improvements
- Improved print status messages
- Lazier homing, more cautious calibration
- Autoload improvements
- Unified XL & CORE One chamber filtration
- Option to continue after nozzle cleaning failure
- Print sheet detection (MK4 family)
- Respect maximum printed Z position
- Gearbox alignment calibration (XL)
- Filament change from Tune menu in any tool (XL)
- Support cancelling more objects
- Wi-Fi signal strength indicator
- BSOD knob press behavior
- Reworked filament sensor evaluation
- Ukrainian language support for all printers
- Fixes
- All the fixes from the 6.3.X releases have been expanded to other printers.
- Various fixes and stability improvements
Handbook 1.09
April 06, 2022
Changes in 1.09
- Updates related to Printables.com
- Several small changes
Firmware 1.8.0
March 11, 2025
Changes in 1.8.0
- 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
Handbook 1.08
April 03, 2024
Changes in 1.08
- Updating information on package contents
Firmware 3.3.0
May 16, 2023
Changes in 3.3.0
- 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
Firmware 6.5.3
March 23, 2026
Changes in 6.5.3
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Handbook 1.01
October 23, 2024
Changes in 1.01
Correction of product information
Minor content updates
Firmware 6.4.0
November 25, 2025
Changes in 6.4.0
- New features
- Automatic chamber vent opening/closing (C1/+)
- Belt tuning wizard (C1/+)
- Faster and more responsive Prusa Connect experience
- Nozzle cleaning failed wizard
- Auto-retract (MK4 family, XL)
- Auto-retract improvements (C1/+)
- Auto-retract disable option (C1/+)
- Selective factory reset
- Chamber support for backwards G-Code compatibility (C1/+)
- Changes and improvements
- Improved print status messages
- Lazier homing, more cautious calibration
- Autoload improvements
- Unified XL & CORE One chamber filtration
- Option to continue after nozzle cleaning failure
- Print sheet detection (MK4 family)
- Respect maximum printed Z position
- Gearbox alignment calibration (XL)
- Filament change from Tune menu in any tool (XL)
- Support cancelling more objects
- Wi-Fi signal strength indicator
- BSOD knob press behavior
- Reworked filament sensor evaluation
- Ukrainian language support for all printers
- Fixes
- All the fixes from the 6.3.X releases have been expanded to other printers.
- Various fixes and stability improvements
Handbook 1.01
October 23, 2024
Changes in 1.01
Correction of product information
Minor content updates
Firmware 6.5.3
March 23, 2026
Changes in 6.5.3
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Handbook 1.03
September 20, 2023
Changes in 1.03
Updated with instructions for MK3.9 upgrade
Firmware 6.5.3
March 23, 2026
Changes in 6.5.3
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]
This is the release candidate for the upcoming firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S and MK3.9.
For a complete overview of features introduced in firmware 6.5.3, users can refer to the 6.5.3-beta published earlier.
Firmware 6.4.0
November 25, 2025
Changes in 6.4.0
- New features
- Automatic chamber vent opening/closing (C1/+)
- Belt tuning wizard (C1/+)
- Faster and more responsive Prusa Connect experience
- Nozzle cleaning failed wizard
- Auto-retract (MK4 family, XL)
- Auto-retract improvements (C1/+)
- Auto-retract disable option (C1/+)
- Selective factory reset
- Chamber support for backwards G-Code compatibility (C1/+)
- Changes and improvements
- Improved print status messages
- Lazier homing, more cautious calibration
- Autoload improvements
- Unified XL & CORE One chamber filtration
- Option to continue after nozzle cleaning failure
- Print sheet detection (MK4 family)
- Respect maximum printed Z position
- Gearbox alignment calibration (XL)
- Filament change from Tune menu in any tool (XL)
- Support cancelling more objects
- Wi-Fi signal strength indicator
- BSOD knob press behavior
- Reworked filament sensor evaluation
- Ukrainian language support for all printers
- Fixes
- All the fixes from the 6.3.X releases have been expanded to other printers.
- Various fixes and stability improvements
Firmware 3.14.1
November 28, 2024
Changes in 3.14.1
- 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.pyto be able to compile the firmware - MMU related changes
- Minor fixes
- Community related changes
Firmware 3.14.1 (3.0.3)
November 28, 2024
Changes in 3.14.1 (3.0.3)
- 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.pyto be able to compile the firmware - MMU related changes
- Minor fixes
- Community related changes
Firmware 6.4.0
November 25, 2025
Changes in 6.4.0
- New features
- Automatic chamber vent opening/closing (C1/+)
- Belt tuning wizard (C1/+)
- Faster and more responsive Prusa Connect experience
- Nozzle cleaning failed wizard
- Auto-retract (MK4 family, XL)
- Auto-retract improvements (C1/+)
- Auto-retract disable option (C1/+)
- Selective factory reset
- Chamber support for backwards G-Code compatibility (C1/+)
- Changes and improvements
- Improved print status messages
- Lazier homing, more cautious calibration
- Autoload improvements
- Unified XL & CORE One chamber filtration
- Option to continue after nozzle cleaning failure
- Print sheet detection (MK4 family)
- Respect maximum printed Z position
- Gearbox alignment calibration (XL)
- Filament change from Tune menu in any tool (XL)
- Support cancelling more objects
- Wi-Fi signal strength indicator
- BSOD knob press behavior
- Reworked filament sensor evaluation
- Ukrainian language support for all printers
- Fixes
- All the fixes from the 6.3.X releases have been expanded to other printers.
- Various fixes and stability improvements
Handbook 1.09
April 06, 2022
Changes in 1.09
- Updates related to Printables.com
- Several small changes
Firmware 3.14.1
November 28, 2024
Changes in 3.14.1
- 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.pyto be able to compile the firmware - MMU related changes
- Minor fixes
- Community related changes
Firmware 3.14.1
November 28, 2024
Changes in 3.14.1
- 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.pyto be able to compile the firmware - MMU related changes
- Minor fixes
- Community related changes
Handbook 2.62
June 12, 2020
Changes in 2.62
Reflects changes introduced in FW 3.9.0:
- First layer calibration chapter updated
- Linear Advance chapter updated
- Display brightness chapter added
- LCD menu structure updated
- MINTEMP information updated
Firmware 1.8.0
March 11, 2025
Changes in 1.8.0
- 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
Handbook 1.05
June 12, 2020
Changes in 1.05
- Added information reflecting changes in firmware 1.4.0
- Added instructions on print display replacement and UV LED panel calibration
- Updated firmware update information
Firmware 3.3.0
May 16, 2023
Changes in 3.3.0
- 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
Handbook 1.01
August 28, 2020
Changes in 1.01
- Reflects changes introduced in FW 3.0.0
Firmware 3.14.1
November 28, 2024
Changes in 3.14.1
- 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.pyto be able to compile the firmware - MMU related changes
- Minor fixes
- Community related changes
Handbook 3.04
September 12, 2018
Changes in 3.04
- Loading filament (updated chapter)
- LCD screen (updated chapter)
- Beeper settings (new chapter)
- Language settings (new chapter)
- MMU 2.0 (new chapter)
- Slic3r PE (updated chapter)
- Filament sensor (updated chapter)
- Updating firmware (updated chapter)
- Linearity correction (new chapter)
Firmware 3.14.1
November 28, 2024
Changes in 3.14.1
- 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.pyto be able to compile the firmware - MMU related changes
- Minor fixes
- Community related changes
Handbook 2.51
May 31, 2018
Changes in 2.51
- Error messages (Chapter 14) added
- Nozzle change walkthrough updated
- Firmware 3.2.1 update (Linear Advance, Safety Timer, Stall guard)
- New photos (steel sheet, first layer)
Firmware 3.2.3
June 06, 2019
Changes in 3.2.3
- Preheat error improved
- Improved temperature regulation
- Remaining time estimation
- Adjustable beeper notifications
- Incomplete file check updated
- G-code fixes (M27, M110, M115)
Handbook 2.02
January 04, 2018
Changes in 2.02
- update based on changes in firmware v3.1.0 - Wizard, Linear Advance, SD Card sorting, etc.
- Materials chapter update
Firmware 3.2.3
June 06, 2019
Changes in 3.2.3
- Preheat error improved
- Improved temperature regulation
- Remaining time estimation
- Adjustable beeper notifications
- Incomplete file check updated
- G-code fixes (M27, M110, M115)
Handbook 1.0
September 13, 2017
Changes in 1.0
- proper initial version
- added ColorPrint MM
- tested filaments
- troubleshooting
Firmware 3.0.12
June 23, 2017
Changes in 3.0.12
- 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
Handbook 1.01
September 09, 2015
Changes in 1.01
Manual is suitable even for 3mm version except material temperatures and images.
