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6.4.0-RC Firmware for Prusa MK4S  

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Jan Kratochvíl
 Jan Kratochvíl
(@jan-kratochvil)
Member Admin
6.4.0-RC Firmware for Prusa MK4S

Summary

  • New features
    • Nozzle cleaning failed wizard
  • Fixes

This is the release candidate for the upcoming firmware 6.4.0 for the Prusa CORE One, MK4S, MK4, MK3.9S and MK3.9. It reunifies the firmware development branch after the temporary split during the CORE One launch, where 6.3.x was released exclusively for CORE One and other printers remained on 6.2.x – along with bringing new features, improvements, and fixes across all platforms.

Builds for XL, MINI, MK3.5S and MK3.5 are temporarily not included due to identified issues currently under investigation.

For a complete overview of features introduced in firmware 6.4.0, users can refer to the 6.4.0-alpha release notes published earlier.

Nozzle cleaning failed wizard

The recovery process for failed nozzle cleaning has been reworked into a new step-by-step wizard. It replaces the previous purge option introduced in 6.4.0-alpha.

The wizard also includes a filament retraction step to prevent oozing before retrying the automatic cleaning sequence, increasing the chance of successful recovery.

Release notes: 

https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.4.0-RC

Posted : 23/09/2025 8:43 am
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