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                  1. Support
                  2. Original Prusa MK3.5S
                  3. Changelog

                  Original Prusa MK3.5S Changelog

                  Changelog is also available in following languages
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                  Version 7.0.0

                  15.10.2026

                  New features

                  • PVA and BVOH filament presets [6.9.2]
                  • Filament color support
                  • Tool mapping presets and Smart mapping
                  • Runout Reaction setting for instant or delayed runout handling (#5423)
                  • Reworked tool mapping screen [MMU] [6.6.0]

                  Changes and improvements

                  • New versioning policy
                  • Reorganized Tune menu [6.9.0]
                  • Tool mapping is now preserved when reprinting a job [MMU] [6.9.0]
                  • New Customize button for tweaking a loaded filament
                  • Filament sensor selftest now detects a disconnected sensor [6.9.0]
                  • G-code lines sent over USB/serial that are too long now show a warning
                  • PrusaLink file downloads now keep long file names
                  • Prusa Connect now shows changed chamber, fan and light values within seconds
                  • MMU filament menu now shows the loaded filament and its color [MMU]

                  Fixes

                  • Improved security and robustness
                  • Fixed the Wi-Fi connection hanging after a communication error [6.9.1, 6.10.2]
                  • Fixed the PNG thumbnail of plain G-code files not showing in Prusa Connect
                  • Fixed chamber temperature serial reporting format
                  • Fixed an extra blob of filament when resuming after a power failure [6.9.0]
                  • Fixed settings being lost when power was cut while they were being saved [6.10.1]
                  • Fixed retract or purge running on a nozzle cooled down by the safety timer [6.9.0]
                  • Fixed the Not enough tools G-code check blocking prints with no way to bypass it
                  • Fixed a crash when the door was opened during homing
                  • Fixed wrong remaining time after resuming from a power failure [6.9.0]
                  • Fixed factory reset of the HW configuration not resetting calibrations [6.9.0]
                  • Fixed M340 refusing to set the syslog host when metrics were allowed [6.9.0]
                  • Fixed a crash on the print preview screen
                  • Fixed text overflowing on the factory reset screen
                  • Fixed a crash when changing Front PTFE Length [MMU]
                  • Fixed tool mapping being ignored when starting a print from Prusa Connect
                  • Display glitch recovery now also works on error and boot screens
                  • Fixed not saving a crash dump on a red screen error (RSOD) [6.9.0]

                  Version 6.5.7

                  18.06.2026

                  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

                  Version 6.5.3

                  24.03.2026

                  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.

                  Version 6.4.0

                  25.11.2025
                  • 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

                  Version 6.2.6

                  03.09.2025

                  Summary

                  • Display refresh rate fallback to improve stability
                  • Fixes for rare BSOD crashes during filament handling

                  Contents

                  • Version 7.0.0
                  • Version 6.5.7
                  • Version 6.5.3
                  • Version 6.4.0
                  • Version 6.2.6