Firmware 3.5.2-RC1 for Original Prusa i3 MK3/MK2.5 MMU2  

Firmware 3.5.2-RC1 for Original Prusa i3 MK3/MK2.5 MMU2

UPDATE: final version 3.5.2 is out https://shop.prusa3d.com/forum/general-discussion-announcements-and-releases-f53/firmware-3-5-2-final-for-original-prusa-i3-mk3-mk2-t27892.html

Hi guys,
this is an upgrade of the firmware for the Original Prusa i3 MK3/MK2.5 MMU2. Keep in mind this a release candidate (testing version) for experienced users 😎

What is new?
-> More quiet print fan operation
-> Heatbed regulation improved
-> Improved heater temperature regulation
-> Spool join for multi-material prints
-> Smarter load/unload function
-> Mintemp for MK2.5 updated
-> SD card menu is shown automatically when the card is inserted
-> Safer communication between MMU2 and printer
-> Crash detection for zero target temperature fixed

More quiet print fan operation:
This change is significant especially for low fan speeds.

Heatbed regulation improved:
Heatbed PWM now works on a higher frequency. This helps to reduce the power supplies "clicking" noises.

Improved heater temperature regulation:
When changing temperatures during the print, temperature regulation was very slow in some cases led to preheat error. Regulation has been improved. This should solve issue #1362.

SpoolJoin for multi-material prints:
It is now possible to use the "SpoolJoin" function also with multi-material prints. If some filament is depleted, the printer replaces it with next filament for the rest of print (for example if filament 2 was depleted, the printer starts using filament 3 instead). If there is no filament which can be used (all filaments were depleted), the printer waits for the user to insert new filament manually.

Smarter load/unload function:
If a user chooses load (or unload) in the menu with a cold nozzle, nozzle preheat menu automatically appears. After selecting material, preheat starts. When the nozzle is hot and the printer is ready for a load, beeper signal occurs. This function is working on single material printers with load/autoload and unload. It is not currently implemented for multi-material printers (load to nozzle, unload and eject).

Mintemp for MK2.5 updated:
"Mintemp" is now checked after a short period of preheating. This is necessary for maximum reliability on all MK2.5 Rambo boards.
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Supported printers:
Original Prusa i3 MK3
Original Prusa i3 MK3 MMU2
Original Prusa i3 MK2.5
Original Prusa i3 MK2.5 MMU2

Download link:
https://github.com/prusa3d/Prusa-Firmware/releases/tag/v3.5.2-RC1

Firmware flashing guide:
https://manual.prusa3d.com/Guide/Upgrading+the+firmware+v1.5/66

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!