Original Prusa MK3.9S Changelog

New features

• New M204 F filament acceleration limit, enabled by default

Changes and improvements

• Prusa Connect now receives per-tool data, consumed filament weight, loaded material and spool weight
• Error screens no longer show the printer hash and signature markers; QR code simplified
• BROWN color preset is now brown instead of dark red

Fixes

• Fixed screenshots having slightly wrong colors

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 [6.9.0]
• New Customize button for tweaking a loaded filament
• Stuck filament dialog now offers Ignore and Disable options [6.9.0]
• Parking now lifts the Z axis faster [6.9.1, 6.10.2]
• 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]
• Settings from firmware older than 5.0.0 are no longer migrated [6.6.0]
• Immediate stop on filament runout [6.8.1]
• Reorganized menus [6.8.1]
• Filament compatibility checks in more places [6.8.1]
• Custom filament names may contain lowercase letters [6.8.1]

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]
• Fixed homing failing permanently after an unsuccessful homing sensitivity calibration
• Fixed not restoring the original temperature on filament runout/mid-print change [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
  • 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
  • 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.

• 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