Summary

• New features and improvements
  • Bed LED progress indicator
  • Tuned parking position during purging
  • Vent grille linked to filament preset
  • Preload all MMU slots at once
  • Bootloader update
• Fixes
  • Fixed input shaper axis assignment on CoreXY printers
  • Fixed layer shifts during high-speed curved moves
  • Fixed crash/BSOD on M501 (restore settings) (#4912)
  • Fixed gearbox alignment test showing wrong status when skipped
  • Fixed chamber fans showing "Auto" instead of "Disabled" when not in use

This beta release introduces firmware 6.5.3 for the Prusa CORE One L, CORE One, MK4S, MK4, MK3.9S, MK3.9, MK3.5S, and MK3.5.

For MK4S, MK4, MK3.9S, MK3.9, MK3.5S and MK3.5, this is the first 6.5.x release, meaning all features and improvements from firmware 6.5.0, 6.5.1, and 6.5.2 are also included.

MMU3 owners please note: you need to upgrade the firmware in your MMU3 unit to version 3.0.4 (download link).

Bed LED progress indicator

The CORE One L bed LED indicator now shows the progress of your print, starting from the left and gradually changing from white to blue.

Tuned parking position during purging

The parking position on CORE One and CORE One L has been adjusted so that purged filament flows unobstructed to the bottom, reducing potential debris on the print bed.

Vent grille linked to filament preset

The vent grille now automatically opens or closes based on the target chamber temperature set in the active filament preset. This ensures optimal thermal conditions during printing.

Preload all MMU slots at once

The new menu item Filament MMU - Preload All now asks for the filament type only once and applies it to all slots. This is handy when you want to load, for example, five PLA filaments.

Bootloader update

The bootloader has been updated to version 2.6.0. This creates the necessary foundation for the upcoming INDX upgrade.

Fixed input shaper axis assignment on CoreXY printers

The input shaper X and Y axis parameters were swapped on CoreXY printers, meaning the shaper configured for X was actually applied to Y, and vice versa. This also prevented users from disabling input shaping on only one axis. Both issues are now resolved.

Fixed layer shifts during high-speed curved moves

Layer shifts could occur during high-speed printing with curved moves. The motion system has been improved to address the issue.

Note: Please be aware that not all layer shifts have been caused by this issue.

Release notes

https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.5.3-beta