Prusa MMU3 Enclosed for CORE One / CORE One+ – Assembled unit

Multi-material printing for CORE One and CORE One+

The Original Prusa MMU3 is an optional add-on for the Original Prusa CORE One and CORE One+ that enables printing with up to five filaments on a single nozzle system. Load up to five filaments of your choice, slice the object in PrusaSlicer or EasyPrint, start the print job—and the rest is fully automatic, delivering excellent quality with minimal waste.

Fastest single-nozzle filament switching

With optimized firmware and clever engineering, the MMU3 offers rapid filament swaps, typically ranging from 35 to 45 seconds. Since a multi-material print often involves hundreds or even thousands of changes, these time savings can reduce overall print durations by hours compared to competing systems.

Efficient operation with clean transitions

Every filament change requires purging the previous material from the nozzle to prevent color contamination. The MMU3 minimizes contamination using an intelligent nozzle cleaning method: during filament switches, the printer softens and removes material from the nozzle together with any debris. This results in clean transitions while requiring only a small amount of filament to be purged.

The excess material is efficiently deposited into a compact wipe tower beside the print object. The wipe tower is designed as an efficient, partially hollow structure that purges filament and stabilizes nozzle pressure, while keeping all purged material collected in one place.

Reduced plastic waste with advanced purge strategies

To reduce waste even further, PrusaSlicer includes smart options such as wipe-to-infill (using the model’s infill instead of a wipe tower) and wipe-to-object (using another object as the wipe target). Wipe-to-object can produce a very colorful “sacrificial” item—ideal when you need a functional part or plan to paint it later and want to minimize plastic waste.

What you can do with 5-filament printing

With five filaments loaded and automatically managed by the MMU3, you can create:

• Multi-color decorative models with crisp color separation
• Logos, text and detailed markings integrated into prints
• Multi-material parts with distinct visual/functional sections
• Functional prints using soluble support materials (e.g., PVA/BVOH)
• Complex projects that benefit from frequent, automated filament changes

Outstanding compatibility with no vendor locks

The spoolholders are designed to hold a wide variety of filament spools, including large 2 kg spools, ensuring compatibility with many third-party materials. Thanks to the open design, you can also download (or design) custom spoolholders—for example, for paper-based spools that are more prone to damage.

Smooth filament feeding with buffer cassette

The filament feeding system is engineered for smooth, dependable performance. Filament is first loaded into a buffer cassette, then routed into the MMU3 unit mounted on top of the printer, and finally fed into the extruder. This arrangement minimizes resistance, keeps filament travel smooth, and helps prevent tangling during frequent changes.

Enhanced firmware with two-way communication

The MMU3 firmware provides two-way communication with the printer for reliable, autonomous operation. The system can automatically diagnose and resolve various situations, and it shows real-time status updates and detailed error descriptions on the printer’s LCD screen. You can control the MMU3 through the printer’s LCD menu or via the unit’s onboard buttons for quick manual adjustments.

Reliable performance and easy maintenance

Thanks to robust design and dependable communication, the MMU3 can perform thousands of filament changes without manual interaction. Maintenance is designed to be straightforward: nothing is glued together—components can be taken apart with a screwdriver and repaired when needed.

PrusaSlicer with full MMU support (including Beam Interlocking)

PrusaSlicer offers full support for the MMU3 and an intuitive workflow for multi-color/multi-material preparation. You can paint color areas directly on your model using tools such as a customizable brush, smart fill, and a bucket tool. PrusaSlicer also optimizes material usage with the smart wipe tower plus wipe-to-infill and wipe-to-object for reduced waste and sharp transitions.

A dedicated feature called Beam Interlocking improves how different colors/materials connect by creating a cross-hatched boundary between them, producing stronger multi-color/multi-material objects that hold together better after printing.

EasyPrint: slicing on the go

CORE One / CORE One+ with the MMU3 is supported in EasyPrint for convenient slicing on phone or in a browser. You can pick models from Printables.com, set basic parameters like quality and material, and send the file to the printer. EasyPrint also supports smart painting of single-color models—perfect for MMU workflows.

Important nozzle information

For the best performance (speed and efficiency with low waste) on both the MK4/S and CORE One platforms, the standard nozzle is recommended instead of a high-flow variant. When ordering a standalone MMU3 for your MK4S or CORE One, the MMU3 comes with a standard quick-swap nozzle included. In bundles, both nozzles are provided (and an assembled printer in an MMU3 bundle typically comes with the standard nozzle pre-installed).

Compatibility

• Original Prusa CORE One
• Original Prusa CORE One+