Firmware 3.7.2-FINAL for Original Prusa i3 MMU2S & MMU2
WARNING: Note that MK3S, MK3, MK2.5S and MK2.5 are different printers! Each has its own firmware file!!!
Hi guys,
this is a final version of the firmware recommended to all users 😎
What is new?
- Protection against multiple power panics
- Autonomous fan self-test
- Incorrect firmware flashing protection
- Min. temp safety trigger
- Enforced fan check
- Filament runout delay fix
- Extruder position after fan error fix
- Text format correction on Live adjust Z screen
- Display target temperature at PID calibration screen
A detailed description of changes:
Protection against multiple power panics (for MK3S/MK3/MMU2S/MMU2)
In case of a rare scenario where the printer was in the process of recovering from the first power panic and a second occurred, it might have caused an error and fail the print. Starting this release, the printer is protected against multiple quickly-following power panic scenarios and it should always recover.
Autonomous fan self-test
In the previous release, the user had to assist during the fan test. Now, the self-test is fully automatic. Printer spins up each fan from low to the max RPM and measures the values. Since both fans on the extruder have a different range, it is possible to detect, whether they are connected to the correct socket on the board and whether the fan is able to reach its max RPM.
Incorrect firmware flashing protection
Each of our Original Prusa i3 printers requires a slightly different firmware. The system now checks whether you are flashing the correct hex file. For the future releases, if a wrong file is used, the user is warned during the reboot after the firmware is flashed. We are working on a feature in the PrusaSlicer, which will warn you before the entire process starts.
Min. temp safety trigger
In the case of min. temp scenario, the printer used to run the G-code on the background, but didn't execute any movements nor the filament loading, then displayed min. temp error. The new firmware will immediately restart the printer as soon as min. temp scenario occurs. This is a safety feature to prevent the printer from overheating as min. temp is mostly caused by damaged thermistor reading incorrect temperature values. After the restart, the user can start the print again, but please check whether the print starts correctly.
Enforced fan check
Previously during the "fan error" message, the user was allowed to continue printing without fixing the issue, this no longer possible. Until the error fixed by the user (e.g. removing the jammed filament from the fan), the print is paused. This is a safety feature preventing possible damage to the printer.
Others:
- Filament runout delay fix
- Extruder position after fan error fix
- Text format correction on Live adjust Z screen
- Display target temperature at PID calibration screen
Known issue for the future release:
Shifted print after a power panic
During our internal tests, it was discovered that after multiple power panics in a row, the printer sometimes slightly shifts the print up in the Z axis (tenths of millimetres) during the recovery. Although this is a very unlikely situation in real-world conditions, we are working on a fix.
Prusa Firmware beta testers group
Are you an experienced user, who wants to join our insider testing group? We are looking for skilled users, who are willing to help to improve the firmware. You will be given our most recent versions and provide feedback on any bugs or errors you might encounter. For the most active testers, we have prepared attractive rewards 😉
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Supported printers:
- Original Prusa i3 MK3S MMU2S
- Original Prusa i3 MK3S
- Original Prusa i3 MK3 MMU2
- Original Prusa i3 MK3
- Original Prusa i3 MK2.5S MMU2S
- Original Prusa i3 MK2.5S
- Original Prusa i3 MK2.5 MMU2
- Original Prusa i3 MK2.5
Download link:
Firmware flashing guide:
https://manual.prusa3d.com/Guide/Upgrading+the+firmware/66
Please report any bug here:
https://github.com/prusa3d/Prusa-Firmware/issues
As always, we wish you happy printing and look forward to your feedback!
/ Knowledge Base
The guy behind Prusa assembly manuals...
RE: Firmware 3.7.2-FINAL for Original Prusa i3 MMU2S & MMU2
I just tried my first 2-color Benchy with 3.7.2 - (using a filament that is fated to cause problems (stringing) - also humidity levels here are a bit high)
As expected the filament caused some strings and caused unload errors.
I had two problems:
1) During fixing the unload errors the nozzle rested too long on the wipe-tower, so it got some scars - the nozzle later bumped into them. Bed adhesion was good, so the wipe tower survived, but with less adhesion or a smaller wipe tower this could have caused a serious problem.
2) After fixing about 5 unload errors. The printer continued the print while the nozzle was still cold (~30°C). That gave me a skipped layer - that made the upper part unstable - so the print failed (slightly above the steering wheel).
I like it a lot better when the nozzle isn't hot during the unload error. But I think I have to be careful when fixing unload errors - it's not completely fool proof.