4.4.0-RC1 Firmware for Original Prusa MINI/MINI+ is out!
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4.4.0-RC1 Firmware for Original Prusa MINI/MINI+ is out!  

Same Old Shane
4.4.0-RC1 Firmware for Original Prusa MINI/MINI+ is out!

Greetings all, we are happy to announce the release of a 4.4.0-RC1. Please note that this is a release candidate and is for users with a moderate level of experience working with them. Please make sure to report any issues via our github (link below.)


  • Support for Wi-Fi (ESP-01 & ESP-01S)
  • PrusaLink updates
  • Added translations
  • Remote print checks
  • Bug fixes

This is the public Release Candidate of the upcoming 4.4.0 firmware. There are multiple improvements across the entire firmware including Wi-Fi-related features, PrusaLink optimizations.

There are 37 commits and 15 bug fixes. Kudos to the community for reporting the issues!

ATTENTION: Before you rush flashing new firmware, please note that this time, there are two files needed on the USB flash drive. Both firmware and bootloader must be updated! The entire flashing process is automatic, printer will restart several times.

Support for Wi-Fi (ESP-01 & ESP-01S)

This firmware release brings some under-the-hood improvements to already existing implementation of the Wi-Fi support for the MINI+/MINI. More information about the ESP Wi-Fi including the setup is available in the 4.4.0-BETA2 release notes.

PrusaLink updates

The entire PrusaLink experience (the web management interface for the printer) has been updated with new features and bug fixes.

  • Fallback for missing translations (to English)
  • UI improvements
  • A-Z file sorting (currently only one supported)
  • Removed the Download button*

*This is a temporary action, once the download feature is fixed, the button will return into the web user interface.

Added translations

In the previous firmware release, only the English language was available for Wi-Fi setup. This firmware version adds new translations.

Remote print checks (experimental)

When you start a remote print, the printer now correctly checks whether the right filament is loaded. If the G-code file is sliced for a different type of filament than the one that is currently loaded, the printer will display a message. Please note this is an experimental feature and might sometimes misbehave.

Bug fixes

  • When uploading G-codes via Wi-Fi, the One-click Print message was incorrectly displayed. This is now fixed.
  • Low-RPM fan errors fixed: when the user lowered the print fan RPM to less than 40, the printer displayed an error message because the system saw the fan as completely stopped. This is now fixed.
  • The filament sensor is no longer enabled by default. This caused an error on printers without a filament sensor - a message was displayed warning the user that filament is not loaded. This is now fixed. When no filament sensor is detected, it is automatically disabled.
  • Fixed filament unload for the first layer calibration. When the user wanted to change filament before the first layer calibration, the unload was successful, but the printer did not follow up with the filament loading procedure. This is now fixed
  • Safety timer at the end of the first layer calibration: if the user kept the printer running after the first layer calibration procedure with the “Do you want to repeat…” message on the screen, the printer continued to heat up the nozzle and the bed. This is now fixed. Once the procedure ends, the heating is disabled and is only re-enabled after the user’s interaction.
  • First layer calibration ignored Mesh Bed Leveling errors and no warning message was displayed. This is now fixed.
  • Incorrect filament displayed after a filament runout. If the user loaded a PETG filament, restarted the printer and started a print during which a filament runout occurred, the printer then shows PLA as the loaded filament. This is now fixed.
  • Extruder location for filament change fixed. The parking position of the extruder was taken over from the homing of the X-axis. - - This could cause a situation where the extruder would be directly over a print during a filament change. To prevent possible damage to the printed model, the parking position was reverted to the original state - to the end of the X-axis.
  • Flashing ESP (Wi-Fi) during printing is no longer possible. Previously, it was possible to navigate through the Tune menu during the printing process to the ESP flashing option which would cause the print process to jam. These menu options are no longer interactive during a print job.
  • Configuration saving in experimental menu fixed. Previously, if the user set E-Steps in the experimental menu and then adjusted the Footer, the E-Step value was not saved. This was fixed by removing the Footer from the experimental menu.
  • Unload filament double-click bug fixed. Previously, if the user chose Unload in the Filament menu and proceeded to select Load or Unload, the menu item had to be clicked twice.
  • Flashing texts fixed by adjusting the way how texts are rendered
  • Assist sound mode issues in the Print menu are now fixed
  • OctoPrint logo is now correctly displayed after the connection is established
  • Flashing screen during filament change is now fixed

Supported printer:

Original Prusa MINI
Original Prusa MINI+

Download Link:


How to flash the firmware on MINI:

Copy the firmware file (.bbf) onto the USB drive with FAT32 formatting Insert the flash drive in the MINI's USB port Turn the printer ON (or reboot it) A new screen will appear Confirm you want to flash the firmware

Please report any bug here:


As always, we wish you happy printing and look forward to your feedback!

Shane (AKA FromPrusa)

Posted : 29/09/2022 7:01 pm
New Member
RE: 4.4.0-RC1 Firmware for Original Prusa MINI/MINI+ is out!

Hello all !
I try to update with this release putting the both files on the flash drive.
The bootloader was updated successfully but after the printer stopped.
The screen message was "Looking for .bbf file"
On Github the name of the file Buddy_4.4.0-RC1+4164.bbf is wrong.
I have rename-it Buddy_pre_4.4_4.4.0-RC1+4164.bbf and the install worked.
Happy printing to all !

Posted : 29/09/2022 8:48 pm
printing overnight
RE: 4.4.0-RC1 Firmware for Original Prusa MINI/MINI+ is out!
  • Configuration saving in experimental menu fixed. Previously, if the user set E-Steps in the experimental menu and then adjusted the Footer, the E-Step value was not saved. This was fixed by removing the Footer from the experimental menu.

 Okay, but how do you configure the footer now?

Posted : 30/09/2022 8:11 pm
New Member
Time differences between Prusa Link and Display - Bug

It is not a disturbing bug but I think for the developers the information could be useful !

If the Stealth Mode is enabled the Prusa Link is showing the Stealth Mode finishing time and the display is showing the normal printing time.

Example of Finishing time

Prusa Link : 6.03 h
Display       : 5.06 h

Posted : 01/10/2022 7:06 pm
Active Member
RE: 4.4.0-RC1 Firmware for Original Prusa MINI/MINI+ is out!

Hello to the Team.

Why needs to heat bed while load/unload filament or changing filament?
If  I put filament or change it that doesn't mean that I will print immediately.
Why to spend energy for nothing?

Best Wishes.



Posted : 16/10/2022 8:33 pm
Filep liked
New Member
RE: 4.4.0-RC1 Firmware for Original Prusa MINI/MINI+ is out!

Error 12608 

Posted : 25/10/2022 5:50 pm
Reputable Member
RE: 4.4.0-RC1 Firmware for Original Prusa MINI/MINI+ is out!

If you want support from the developers, see the link they posted above to report an issue:


For Error 12608 there is already an issue raised and a discussion at:


Maybe that will help you.

For the time difference issue, I cannot find a mention of that bug, so you would have a much bigger chance of actually having the developers know about it by reporting an issue at the link above.

The heatbed issue is discussed here:




Posted : 25/10/2022 8:12 pm
Trusted Member

Does the firmware specifically require the ESP-01? 

Still got a bunch of ESP-12s and was wondering, whether it's possible to reuse one of those to enable the WiFi access

Prusa Mini FW4.2.4

Posted : 13/11/2022 12:47 am
Black Swan
New Member
RE: 4.4.0-RC1 Firmware for Original Prusa MINI/MINI+ is out!

Are there any news on when to expect stable release or next RC? Or should I just flash RC1 instead of waiting for stable one? 

Posted : 16/11/2022 1:51 pm