6.5.3-RC Firmware for Prusa MK4S

Summary

• • New features and improvements

• Massively speed up MMU filament changes [MMU]

• Updated default input shaper profiles [C1, C1L]
• Updated translations (beta didn’t have new texts translated)
• (+ changes from the beta)

• Fixes

• M1704 MMU load test gcode now considers toolmapping [MMU]
• Fixed MMU sending spurious attention reports to Prusa Connect during normal toolchanges [MMU]

Massively speed up MMU filament changes [MMU]

A series of improvements have been implemented that massively speed up MMU filament changes by up to 9 seconds. Some changes in the MMU firmware were required as well, so it is necessary to flash a new 3.0.4 firmware to your MMU unit.

The improvements include:

• Parallelized unloading filament from the nozzle and idler engaging.
• The printer does not wait for the final idler disengagement to finish to continue printing.
• Parallelized selector and idler movement.
• FeedingToFinda phase now obeys PulleySlowFeedrate with higher value.
• Optimized idler selection mechanism during filament change.

Updated default input shaper profiles [C1, C1L]

In 6.5.3-beta, we’ve fixed a bug causing input shaper configurations to be swapped on the CoreXY printers. As a result, new input shaper profiles needed to be calibrated as well.

If you have Core ONE L or an accelerometer accessory, we recommend re-running your input shaper calibration.

If you don’t have an accelerometer, we recommend resetting your input shaper profiles to defaults using the Settings → Input Shaper → Restore Defaults. If you haven’t changed your input shaper settings, the values should update automatically.

Release notes

https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.5.3-RC