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


In stock (can be backordered)

Lead time on kits is around 3 weeks

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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 MMU2S Prusa 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.




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.




The testing process of the MMU2S took 2 months to finish, they used 20 printers and they 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.





  • 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




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)
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