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MK4 kit shipping from $50 (DHL)

Original Prusa MK3S+ MMU3 upgrade kit to MK4/MK3.9

This product includes:

  • Printed parts for MK4/MK3.9 Nextruder
    • Idler-lever-A (1 pc)
    • Idler-lever-B (1 pc)
    • Idler-nut-FS (1 pc)
    • Screw-guide (1 pc)
    • Swivel-A (1 pc)
    • Swivel-B (1 pc)
    • PG-assembly-adapter (1 pc)
    • Main-plate (2 pcs)
  • Mechanical and other parts
    • Magnet 3x1 (2 pcs)
    • QSM-M5 fitting-2.6 (2 pcs)
    • Prusa lubricant (1 pc)
    • M3x35 mm screw (2 pcs)
    • M3x22 mm screw (2 pcs)
    • PTFE 4x2x360 mm (2 pcs)
    • M3nN nut (3 pcs)
    • MMU3 printer cable xBuddy (1 pc)
    • Zip tie (20 pcs)
    • O-ring 24,5x1,5 (2 pcs)
    • ELE cover (1 pc)
    • PD-board-cover (1 pc)
    • Injection molded spoolholder (5 sets)

Not included:

  • Tools are not included in this upgrade, you can purchase optional tool set.
  • Updated printable buffer parts are not part of the upgrade, you can download the G-codes from Printables.
3D printer is not included in this package.

Tools required for this upgrade:

  • 2.5mm Allen key
  • Torx key TX6
  • Torx key TX10/8
  • Needle-nose pliers
  • Wrench 8 mm (for QSM-M5 fittings)
This upgrade is designed for users who already have an MK3S+ MMU3 setup and have recently upgraded their printer to MK3.9 or MK4. This package includes all the necessary parts to connect your MMU3 unit to the MK3.9/MK4.

Online Assembly Manual, Handbook (EN) (change)

In stock

Preparation time: 1-3 business days.


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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