6.5.3 Firmware for Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S, MK3.9, MK3.5S, MK3.5
- Bed LED progress indicator on C1L showing print progress from left side with color change from white to blue
- Vent grille now automatically opens or closes based on target chamber temperature set in active filament preset on C1+ and C1L
- Preload all MMU slots at once with single filament type selection
- Massively speed up MMU filament changes by up to 9 seconds through parallelized unloading and idler engaging, optimized idler selection, and improved FeedingToFinda phase
- Updated default input shaper profiles for C1+ and C1L
- Updated translations
- Tuned parking position during purging on C1, C1+, and C1L to reduce potential debris on print bed
- Increased maximum supported AC supply voltage for the AC controller to 264 V on C1L
- Updated bootloader to version 2.6.0
- Lowered chamber safety temperatures on C1 with fans starting at 60 °C and overheating warning pause at 65 °C
- Fixed input shaper X and Y axis assignment on CoreXY printers which were previously swapped
- Fixed layer shifts during high-speed curved moves
- Fixed M1704 MMU load test gcode to consider toolmapping
- Fixed MMU sending spurious attention reports to Prusa Connect during normal toolchanges
- Fixed crash or BSOD on M501 restore settings command
- Fixed gearbox alignment test showing wrong status when skipped
- Fixed chamber fans showing Auto instead of Disabled when not in use on C1, C1+, and C1L
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)
- Bed LED progress indicator [C1L]
- Tuned parking position during purging [C1, C1+, C1L]
- Vent grille linked to filament preset [C1+, C1L]
- AC supply voltage for the AC controller has been increased [C1L]
- Preload all MMU slots at once [MMU]
- Bootloader update
- Lowered chamber safety temperatures [C1]
- Fixes
- Fixed input shaper axis assignment on CoreXY printers
- Fixed layer shifts during high-speed curved moves
- M1704 MMU load test gcode now considers toolmapping [MMU]
- Fixed MMU sending spurious attention reports to Prusa Connect during normal toolchanges [MMU]
- 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 [C1, C1+, C1L]
This is the stable release of firmware 6.5.3 for the Prusa CORE One L, CORE One+, CORE One, MK4S, MK4, MK3.9S, MK3.9, MK3.5S and MK3.5 bringing targeted stability improvements and fixes.
Massively speed up MMU filament changes [MMU]
A series of improvements have been implemented that massively speed up MMU filament changes by up to 9 seconds. Some changes in the MMU firmware were required as well, so it is necessary to flash a new 3.0.4 firmware to your MMU unit.
The improvements include:
- Parallelized unloading filament from the nozzle and idler engaging.
- The printer does not wait for the final idler disengagement to finish to continue printing.
- Parallelized selector and idler movement.
- FeedingToFinda phase now obeys PulleySlowFeedrate with higher value.
- Optimized idler selection mechanism during filament change.
For more information about MMU improvements and the CORE One L MMU3, check out our blog post.
Updated default input shaper profiles [C1+, C1L]
In 6.5.3-beta, we’ve fixed a bug in the input shaper configuration of our CoreXY printers. If you haven’t changed your input shaper settings, the new values will update automatically.
NOTE: If you have CORE One L or an accelerometer accessory, we recommend re-running your input shaper calibration. If you modified these values in the past we recommend resetting your input shaper profiles to defaults using the Settings → Input Shaper → Restore Defaults.
Bed LED progress indicator [C1L]
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 [C1, C1+, C1L]
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 [C1+, C1L]
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.
AC supply voltage for the AC controller has been increased [C1L]
Based on user feedback, we have increased the maximum supported AC supply voltage for the AC controller to 264 V.
Preload all MMU slots at once [MMU]
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.
Lowered chamber safety temperatures [C1]
Chamber fans now start to spin at 60 °C and the printer shows a "chamber overheating" warning, pausing the print at 65 °C.
Please note that the maximum chamber target temperature is unchanged at 55 °C, only safety margins for emergency cooling have been adjusted.
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.