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Original Prusa MMU2S to MMU3 upgrade for MK4


What's new in MMU3?

  • Completely new firmware written from scratch
  • Full two-way communication with the printer, Compatible with the MK3S+
  • LCD screen integration (status messages, real-time information, error codes)
  • All plastic parts were redesigned with a focus on easier assembly and maintenance
  • New metal parts to make the unit more robust and reliable
  • Improved electronics

Sample Prints

MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU3 sample print
MMU2S to MMU3 upgrade package includes
  • PD Addon board + power/data cable*
  • Filament (2x 400g)
  • Selected printed parts (label-plate, selector-front-plate)
  • PTFE tubes and others
  • Fasteners
  • Extruder parts* (mechanical and printed)* Contents are based on the selected printer
* Contents are based on the selected printerTools: (optional)
  • 1.5 mm Allen key
  • 2.0 mm Allen key
  • 2.5 mm Allen key
  • Needle-nose pliers
  • Philips screwdriver PH2 (MK3S+ power terminals)
  • Wrench 8 mm ( for QSM-M5 fittings)

Please check out current information about the MK4 MMU3 Upgrade status in our blog article.

Since the release of the MMU2S (previous model), we’ve been collecting your feedback and started preparing something like an MMU2S+. However, at one point, we decided to completely rewrite the firmware from scratch, redesign the plastic parts, add more robust metal parts, improve the electronics, update the filament buffer, and add support for the MK4… thus, the MMU3 was born.

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

Plastic parts are not included in the package. You need to print them yourself.

Important links: MMU3 Assembly Guide MMU3 Printable Parts

Handbook (EN) (change)

In stock

Preparation time: 1-3 business days.

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Why the Original Prusa 3D Printer?

  • 1

    Great Support

    We are providing full 24/7 customer support with live chat and e-mail in several languages.

  • 2


    If you buy our 3D printer, you can upgrade it later to the new version, no need to buy a new model.

  • 3

    Ready to print settings

    In PrusaSlicer you can set everything you want. It's very easy to use and gets new features regularly.

  • 4

    Best Assembly instructions

    Pictured to the smallest detail with all fasteners and mechanical parts having 1:1 drawing.

  • 5

    Fun to Assemble

    Assembling the kit is an excellent first step to the world of 3D printing. Get fun and knowledge!

  • 6

    Quality Garanteed by Josef Prusa

    We operate 700+ printers running 24/7. We need high-quality for our own use – and we design our machines to meet these criteria.



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