• Improved phase stepping calibration
• Fixed homing issues with no tool picked
• Fixed toolchanger service moves being affected by user feedrate override
• Relaxed nozzle cleaning checks to prevent false nozzle cleaning failed errors
• Relaxed print fan selftest thresholds to reduce false failures
• Known issue - Power panic resulting in a BSOD

This is the stable release of firmware 6.4.1 for the Prusa XL bringing targeted stability improvements and fixes - most notably addressing several homing and toolchanging reliability issues.

Improved phase stepping calibration

The switch to the new universal phase stepping calibration in the 6.4 release caused a regression in the calibration quality for some XL users. In 6.4.1, the calibration method has been refined and further improved by backporting phase stepping fixes from the 6.5 releases. These changes enhance overall calibration reliability and address regressions introduced in earlier 6.4 builds.

Fixed homing issues with no tool picked

Homing without a tool picked could cause audible motor skipping or put the printer into an invalid state under certain conditions. The fix ensures that the axes are properly homed before attempting a tool pick, preventing both issues.

Fixed toolchanger service moves being affected by user feedrate

Tool parking, picking, and alignment moves could be slowed down if a low feedrate was set in G-code beforehand. This could lead to unreliable tool changes. All toolchanger service moves now run at their intended speeds regardless of the user feedrate setting.

Relaxed print fan selftest thresholds to reduce false failures

The print fan selftest could incorrectly report a failure on some units due to tight RPM thresholds that did not account for normal fan-to-fan variation across different fan shroud revisions. The thresholds have been relaxed to reduce false failures.

Release notes: 

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

• Improved phase stepping calibration
• Fixed homing issues with no tool picked
• Fixed toolchanger service moves being affected by user feedrate override
• Relaxed nozzle cleaning checks to prevent false nozzle cleaning failed errors
• Relaxed print fan selftest thresholds to reduce false failures
• Known issue - Power panic resulting in a BSOD

This is the stable release of firmware 6.4.1 for the Prusa XL bringing targeted stability improvements and fixes - most notably addressing several homing and toolchanging reliability issues.

Improved phase stepping calibration

The switch to the new universal phase stepping calibration in the 6.4 release caused a regression in the calibration quality for some XL users. In 6.4.1, the calibration method has been refined and further improved by backporting phase stepping fixes from the 6.5 releases. These changes enhance overall calibration reliability and address regressions introduced in earlier 6.4 builds.

Fixed homing issues with no tool picked

Homing without a tool picked could cause audible motor skipping or put the printer into an invalid state under certain conditions. The fix ensures that the axes are properly homed before attempting a tool pick, preventing both issues.

Fixed toolchanger service moves being affected by user feedrate

Tool parking, picking, and alignment moves could be slowed down if a low feedrate was set in G-code beforehand. This could lead to unreliable tool changes. All toolchanger service moves now run at their intended speeds regardless of the user feedrate setting.

Relaxed print fan selftest thresholds to reduce false failures

The print fan selftest could incorrectly report a failure on some units due to tight RPM thresholds that did not account for normal fan-to-fan variation across different fan shroud revisions. The thresholds have been relaxed to reduce false failures.

Release notes: 

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

yesterday I did a first print on my new Core One+ (factory assembled). The print turned out nicely. However I noticed that after the print finished the bed stayed at about half height. The panel indicated that the print finished (100%) the LED strip did light up green. It seems that the only way to get the bed back to the bottom is to navigate to the menu and adjust the Z-axis height manually with the rotary knob. This seems a bit odd to me. I'd expect the printer to move the bed all the way down by itself after finishing a print. Is this normal on a Core One+, is there any setting that makes the printer move the bed back down automatically once a print finishes?