Multi Material Upgrade 2S (MMU2S) is a brand new and improved version of the Multi Material Upgrade 2.0. With an easier calibration process, a new filament sensor, and a standalone filament buffer, the MMU2S is more reliable than ever before.

The testing process of the MMU2S took 2 months to finish, we used 20 printers and we printed 478 test blocks designed to test frequent switching of all five filaments. The total value of filament changes was nearly 600.000 . More than 93 % of this prints were successfully completed.

The MMU2S comes with the filament buffer, a device designed to prevent filament tangling during loading / unloading process. The buffer allows you to position the five filament spools more freely and also saves valuable space on your desk.

With the MMU2S we managed to sense not only that the filament is present, but that it actually reached the Bondtech gears . The filament sensor detects when the idler doors open a bit as the filament pushes Bondtechs apart. MMU2S is much more reliable regarding reloading filaments and the calibration process is also simplified .

WITH THE ORIGINAL PRUSA MMU2S WE ARE INTRODUCING:

Multi Material Upgrade 2S (MMU2S) is the second generation of our unique multi-material addon, which enables your Original Prusa i3 MK2.5S/MK3S 3D printer to print with up to 5 filaments at the same time.

Compared to MMU1, the new MMU2S went through a major revision, resulting in a simpler and more reliable design. The number of simultaneously supported filaments increased to the total of five, which enables the users to print even more complex and more colorful objects.

MMU2S comes with a redesigned body and a new filament loading mechanism. Instead of the previous Bowden system, the new unit uses a direct-drive feed and a single PTFE tube to lead the selected filament to the extruder. The motorized selector head has a F.I.N.D.A filament sensor and a built-in blade, which prevents filament jamming.

Read more about MMU2S in the announcement blog post at Prusaprinters.org and in this upgrade article.

SEE THE MMU2S IN ACTION! Introducing MMU2S How does MMU2S work?

MAIN FEATURES The most significant new features of Original Prusa i3 MMU2S COMPLETELY REDESIGNED MMU2S has a brand new body with a rotating pulley barrel and a single extruder motor. Load up to 5 filaments and the selector head with a filament-cutting blade will take care of automatic loading and unloading. FIVE MATERIALS The second generation of our Multi Material Upgrade supports up to 5 filaments loaded at the same time. Apart from usual materials like ABS, PETG or PLA, the MMU 2.0 also works great with soluble supports (BVOH or PVA). DIRECT DRIVE We have replaced the previous generation's Bowden system with a new direct-drive mechanism. This change is a major step forward in making the filament loading process more reliable and less prone to jamming. F.I.N.D.A FILAMENT SENSOR Meet F.I.N.D.A! It's essentialy a repurposed P.I.N.D.A probe, which now serves as a filament sensor. It works on a mechanical basis - the string of filament lifts a small stainless steel ball and F.I.N.D.A detects its proximity. WIPE INTO INFILL / OBJECT Our slicing software Slic3r PE comes with full MMU 2.0 support and a set of useful features, such as Smart wipe tower, Wipe into infill or Wipe into object. These features help you save time and filament. FILAMENT BUFFER INCLUDED The MMU2S comes with the Filament Buffer, a device designed to prevent filament tangling during loading / unloading process. The buffer allows you to position the five filament spools more freely and also saves valuable space on your desk.

FULL FEATURES LIST MULTI MATERIAL UPGRADE 2S FEATURES Completely redesigned body : less complex and more reliable design

: less complex and more reliable design Printing with up to five filaments at the same time

Old Bowden system replaced with a direct-drive loading mechanism with only a single PTFE tube leading filament to the extruder

Less sensitive to filament quality

Second generation electronics

F.I.N.D.A. filament sensor

filament sensor Motorized selector head with filament cutter

Power loss detection and recovery

Smart software features : Smart wipe tower, Wipe to infill, Wipe into object and many more

: Smart wipe tower, Wipe to infill, Wipe into object and many more Works in two modes : Multi-Material Mode and Single Mode (Single mode is the same as printing on MK3S/2.5S).

: Multi-Material Mode and Single Mode (Single mode is the same as printing on MK3S/2.5S). Includes the Filament Buffer, a device designed to prevent filament tangling COMPATIBILITY INFORMATION Printer Compatibility: Original Prusa i3 MK3 and MK3S

Original Prusa i3 MK2.5 and MK2.5S Please note that the MMU2S package contains the parts for the Multi Material extruder MK3S/MK2.5S upgrade, the MMU2S unit, and the Filament Buffer. You don't need to order MK3S/MK2.5S upgrades separately. Material Compatibility: PLA

ABS

PETG

Soluble Materials (BVOH, PVA)