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6.4.1-RC Firmware for Prusa XL  

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Jan Kratochvíl
(@jan-kratochvil)
Member Admin
6.4.1-RC Firmware for Prusa XL

Summary

  • Fixes
    • Phase stepping fixes from the 6.5 releases

This is the release candidate for the upcoming firmware 6.4.1 for the Original Prusa XL.

For a complete overview of features introduced in firmware 6.4.1, users can refer to the 6.4.1-beta published earlier.

Phase stepping fixes from the 6.5 releases

Phase stepping fixes from 6.5 have been backported to 6.4.1. This improves phase stepping and prevents regressions introduced in earlier 6.4 builds.

Release notes

https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.4.1-RC

Posted : 30/03/2026 2:17 pm
volfion
(@volfion)
Active Member
RE: 6.4.1-RC Firmware for Prusa XL

Hello Jan, may I ask if there will be fixed MBL with PP sheet in upcoming final release? It worked at discontinued 6.4.0 but I was forced to downgrade to 6.2.6 (and deleted 6.4.0 FW), then upgrade to 6.4.1 beta and 6.4.1 RC, but I am unable to print anything on PP sheet (yellow), because MBL does not go through with any model (small, large, ...). The issue is only with PP sheet.

Posted : 14/04/2026 9:16 am
volfion
(@volfion)
Active Member
RE: 6.4.1-RC Firmware for Prusa XL

Hello Jan, again. I would like to point out this thread. I wrote you about my issue in my previous comment and I know from several people from reddit that they have same issue. I tried to edit G-code by hard lowering temp (as per my last comment in mentioned thread) and it worked with PP sheet. I do not know if this is something to take under consideration with full release but it is something that solution might depend on. Thank you for understanding and wishing you nice weekend, Ondrej

Posted : 18/04/2026 1:32 pm
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