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Original Prusa i3 MMU2S upgrade kit (for MK2.5 & MK3S/+)

Multi Material Upgrade 2S (MMU2S) is a brand new and improved version of the Multi Material Upgrade 2.0 - our unique multi-material addon, which enables your 3D printer to print with up to 5 colors at the same time. With an easier calibration process, a new filament sensor, and a standalone filament buffer, the MMU2S is more reliable than ever before.

This product is supplied as a kit - you must assemble it by yourself!

Please note, the assembly manual for the MMU2S upgrade kit is available in digital form only.

Note for MK3 users, you also need to purchase the MK3/S to MK3S+ upgrade kit with the MMU2S.

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.

WITH THE ORIGINAL PRUSA MMU2S WE ARE INTRODUCING:

NEW FILAMENT SENSOR

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.

FILAMENT BUFFER

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.

THOROUGHLY TESTED

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.

 

Multi Material Upgrade 2S (MMU2S) is the second generation of our unique multi-material addon, which enables your Original Prusa i3 MK2.5S or 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 a 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 MMU2S 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 MMU2S 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
  • 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
  • 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
  • Works in two modes: 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 (with upgrade) and MK3S and MK3S+
  • Original Prusa i3 MK2.5S

Material Compatibility:

  • PLA
  • ABS
  • PETG
  • Soluble Materials (BVOH, PVA)

Reviews

90 reviews
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De rooij Dave18 days ago

Very happy with the mmu2s on my 10th year anniversary i3.At first I had a problem with loading the filament. The IR sensor tower was flickering so when I loaded the filament it went into the hotend but then it was retracted out of it. This was happening all the time. After I readjusted the place of the tower with the 1.5 mm allen tool, the printer is working fine with the mmu2s on the test print with 104 colour switches. So double check your sensors before you start using it!

Street Garrylast month

I bought this a year and a half ago and last month i took it off my printer and threw it in the bin. The mk3s is a great printer and all this will do is complicate and ruin your printer. It never works, i am an experienced 3d printer with over 25 printers in my farm and this is a terrible option. Please read this and the many reviews on this product before buying.

delaney katelast month

Very disappointed. I would have thought, having assembled my own Prusa that the MMU2S would be doable but it just isn't! I have spent c. 40 hours on this and dealt with a new challenge at every turn - it is just way too sensitive to work effectively and consistently. I really don't think this product is not ready for market and should not be sold.As much as I respect the Prusa ethos this product has definitely changed my opinion and I absolutely have less trust in the brand as a result. Such a pity.

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