Prusa MMU3 Gets Massive Speed Boost — New Firmware Slashes Filament Change Times by 60%

MMU3 Gets a Much-Needed Speed Upgrade

Prusa Research has released a significant firmware update for the MMU3 multi-material unit, delivering what the company calls a massive speed boost that dramatically reduces filament change times. The update reportedly cuts filament change times by up to 60%, addressing one of the most common complaints from MMU3 users.

What Changed

The firmware optimization focuses on reducing the mechanical movements required during filament swaps. According to Prusa's blog post, the update restructures the loading and unloading sequences to eliminate redundant movements while maintaining reliability. Key improvements include:

• Optimized gear motor movements for faster engagement
• Reduced retraction distances during color changes
• Smarter sensor polling to reduce wait times
• Better handling of partial loads

Before INDX Arrives

The timing of this update is notable — Prusa has been working on the INDX system, which will eventually succeed the MMU3 as the company's next-generation multi-material solution. By squeezing more performance out of the existing platform, Prusa gives current MMU3 owners a meaningful upgrade while the community waits for INDX details.

The INDX prototype was shown at SMRRF 2026 with tool changes reportedly happening in under 10 seconds, setting a high bar for what users can expect from the next generation.

How to Update

The firmware update is available through PrusaSlicer and can be flashed directly through the printer's firmware updater. Users report the update process is straightforward, though some recalibration of filament settings may be needed depending on specific configurations.

With this update, the MMU3 becomes significantly more competitive with alternatives like Bambu Lab's AMS, which has dominated the multi-material space for speed. While still not as fast as the competition, the MMU3's improvement makes it a more viable option for users who prioritize reliability over raw speed.