6.5.3 Firmware for Prusa MK4S
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
- 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 https://github.com/prusa3d/Prusa-Firmware-MMU/releases/tag/v3.0.4&sa=D&source=docs&ust=1773131390056718&usg=AOvVaw1-toj-3WO51cdOwPWjwVd X" rel="nofollow">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.
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
RE: 6.5.3 Firmware for Prusa MK4S
Zero improvements for the MK4 family. *Zero.* Same as the last several firmware updates, iirc.
I wish Prusa would just level with the community that the MK4 line has been abandoned. I wish they had been honest about their intentions back when the Core 1 was announced. I would have upgraded both printers to Core 1s in order to stay on the upgrade path. Instead, all we got was milquetoast "we can neither confirm nor deny..." non-answers about the future of the MK4 line.
I opted to stay with the MK4 line because (1) reliability is top priority for me and a fourth-generation printer line is more reliable than bleeding-edge and more complicated tech, and (2) the upgrade path for these printers - from MK3 to MK3S to MK4 to MK4S - seemed like a better bet for the future than the much more complicated Core 1 line. So instead of the Core 1 upgrades, I bought two Prusa MK4S enclosures. I've been quite happy with those, but in retrospect, the choice was like buying coffins for these printers because they are apparently EOL.
A sad state of affairs. I've been an advocate of Prusa printers for like six years. The damage to my trust in Prusa due to the lack of candor about these choices is difficult to overstate.
RE: 6.5.3 Firmware for Prusa MK4S
I installed it and now it wont let my MMU3 work and says " MMU FW update Needed, the mmu firmware version is incompatible with the printers FW. Update to compatible version. " wouldn't the MMU firmware be included with the 6.5.3?
RE: 6.5.3 Firmware for Prusa MK4S
Looks like that after installation this firmware I've got pretty unstable printing results on my MK4S with random layer shifts.
RE: 6.5.3 Firmware for Prusa MK4S
This release has one major and one minor issues related to the use of the MMU (MK4S/MMU3).
First the Major issue (layer shifting):
a) This problems starts with a build up (ridges etc) on the wipe tower.
b) Then the head hits these ridges at speed and causes layer shifting, in the direction of travel be it X or Y.
Previous SW versions with the same file did not have this issue.
I suspect the ridges may have always been there (have not checked) but the need for speed has caused the head to hit these cold ridges rather than melt through them with a hot head at slower speeds as was previously the case.
Second is a minor annoying issue (missing MMU filament preload menu):
You can no longer preload a single colour without going through the changing the filament menu.
I suspect that in the new version the quick preload menu thread is linked to the old advanced preload menu thread, in error.
NB going back to the older versions (both Printer and MMU) solves both these issues.
RE: 6.5.3 Firmware for Prusa MK4S
for clarification these ridges build up over time specifically when
a) the printing is set to 0.2 structural (0.4 nozzle, all PLA)
b) 2+ or more colours are required on the layer (does depend on tower depth)
c) these same colours are required on multiple consecutive layers.
i.e. the start/stop on each colour is the same and overlays the alternate previous layer.
d) error can occur anytime after about 10+ layers.
Looking at the g-code it is obvious that the start stop on each colour is same on alternate layers and for some reason the start of a colour follow the same part as the end of the previous colour (shown as thin lines in the gcode) if any residue or or early extrusion is present there will obviously be a build up in these areas.
I have an example files (small 2 hour prints) which produce the effect/layer shift (within an hour) should it be required.
If it makes a difference the file was sliced using PruseaSlicer 2.9.4