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The assembled MMU3 for MK4S/MK3.9S enables printing with up to five colors using a single nozzle. A fast multi-material solution for your Prusa printer.
Co je nového ve 3D tisku? Anycubic, Sovol, Elegoo a Prusa ukazují nové technologie
It’s exactly what it sounds like—an optional add-on that upgrades your printer so that even with a single extruder it can print with up to five colors at the same time. Prusa MMU3 offers the fastest single-nozzle multi-material solution while delivering excellent quality and minimal waste.
The MMU3 features five separate filament inputs. Simply load up to five colors of your choice into the unit, prepare your model in PrusaSlicer, and start the print. The system automatically selects the correct filament via the selector, feeds it into the extruder, and the printer begins printing. Based on your project settings, the MMU3 unit automatically picks the right material and feeds it into the nozzle. When it’s time for a material change, MMU3 retracts the current filament, purges the nozzle with only a minimal amount of waste, loads the new filament, and continues printing. MMU3 also allows you to schedule color changes at given layers, and the unit takes care of the entire color-switching process automatically. All that’s left for you is to remove the finished model from the print sheet once the print is done.
MMU3 is designed to combine trouble-free operation with easy maintenance, offering the best possible user experience—the only more advanced solution in this category is the Original Prusa XL printer, which offers up to five independent toolheads.
The high-flow nozzle in the MK4S enables faster printing, but when using MMU3 the standard nozzle makes far more sense. While MMU3 also works with a high-flow nozzle, the increased volumetric flow results in more waste filament during printing. Simply put: MMU3 delivers the best performance, the same speed, and the highest efficiency (the lowest waste) when combined with the standard nozzle on both MK4 and MK4S.
If you order a standalone MMU3 for the MK4S, you will receive it together with the standard nozzle. In the MK4S/MMU3 bundle, you will get both nozzles in the package—the standard and the high-flow nozzle. And for assembled MK4S in a bundle with MMU3, the standard nozzle will be pre-installed on the printer.
Thanks to a fine-tuned firmware and a well-thought-out design, MMU3 performs exceptionally fast filament swaps, averaging between 35 and 45 seconds. Since even a single multi-material print can involve thousands of filament changes, every second saved counts and the resulting difference can amount to several hours.
At every filament change, the nozzle needs to be purged to avoid color mixing. MMU3 uses a smart nozzle cleaning method similar to the cold pull technique, heating the filament just enough to pull it out while carrying away residues, impurities, and other deposits. This ensures clean color transitions with minimal waste filament extruded into a wipe tower—a compact, partially hollow block next to the printed object where purging and pressure stabilization in the nozzle occur. All waste filament is collected in one place, so you don’t need to worry about mess around the printer.
We offer several ways to save filament and reduce plastic waste even further. PrusaSlicer provides options such as infill purging, where the object’s infill is used instead of a wipe tower, or purging into another object, where a separate model serves as the wipe tower. The latter will result in the second print being multicolored, but if you only need a functional part or plan to paint it later, it’s a great way to minimize plastic waste.
The high-flow nozzle in the MK4S enables much faster printing. However, when used with MMU3, the standard nozzle makes more sense. Why? While MMU3 works with a high-flow nozzle, the increased volumetric flow also leads to higher filament consumption. In other words, MMU3 achieves the best performance, the same print speed, and the highest efficiency (i.e., the least waste) when used with the standard nozzle on both MK4 and MK4S.
So, if you order a standalone MMU3 for the MK4S you will receive it along with the standard nozzle. In the MK4S/MMU3 bundle, you will receive both nozzles in the package - the standard one as well as the high-flow nozzle. For assembled MK4S in a bundle with MMU3, the standard nozzle will be pre-installed on the printer by default.
We designed the filament path to be as smooth and reliable as possible. The filament travels through a PTFE tube into the buffer cassette, then continues via another PTFE tube directly into the MMU3 unit. This approach ensures smooth movement with minimal resistance and prevents tangling.
The MMU3 firmware enables two-way communication between the unit and your Prusa 3D printer, ensuring smooth, reliable, and fully automated operation. If a problem occurs, the unit can diagnose and resolve it by itself while displaying up-to-date status information along with a detailed error description directly on the printer’s LCD. You can control the MMU3 through the printer’s menu or via the buttons on the unit for quick manual adjustments—making multi-material printing even easier and more worry-free.
Thanks to the fine-tuned two-way communication between the unit and the printer, reliable filament switching, and robust construction, MMU3 can handle thousands of filament swaps without the need for manual intervention. Combined with simple maintenance, this offers a completely worry-free user experience.
PrusaSlicer fully supports MMU3 and offers an intuitive way to assign colors to different parts of your 3D model. With tools like a customizable brush, smart fill, and the familiar bucket tool, you can easily paint your model and assign each color to a specific extruder. PrusaSlicer also optimizes material usage with features such as a smart wipe tower, infill purging, and purging into another printed object, reducing waste while ensuring crisp color transitions.
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