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  1. Welcome to the tutorial on how to upgrade your Original Prusa i3 MK3/MK2.5 to Original Prusa i3 MK3/MK2.5 Multi Material 2.0
    • Welcome to the tutorial on how to upgrade your Original Prusa i3 MK3/MK2.5 to Original Prusa i3 MK3/MK2.5 Multi Material 2.0

    • This upgrade kit is NOT compatible with Original Prusa i3 MK2/S!!! You need to upgrade first to Original Prusa i3 MK2.5.

    • This upgrade kit is also NOT designed for the first generation of the MK2 Multi Material. You should purchase: Multi Material upgrade kit - from MK2 MMU to MK3/MK2.5 MMU 2.0

    • Before proceeding further make sure the printer has no filament loaded to the extruder and disconnect the printer from the electricity (unplug the cable)!!!

  2. The kit includes:
    • The kit includes:

    • Needle-nose pliers (1x)

    • Philips screwdriver (1x)

    • Allen key (4x)

    • 8mm wrench

    • No soldering is required.

    • No wire crimping is required.

    • The colour of the tools might differ.

  3. Most of the labels are scaled 1:1 and can be used to identify the part :-)
    • Most of the labels are scaled 1:1 and can be used to identify the part :-)

    • Label on the picture is used as an example, yours might be different.

  4. When you browse the guide on manual.prusa3d.com, you can view the original  images in high resolution for clarity.
    • When you browse the guide on manual.prusa3d.com, you can view the original images in high resolution for clarity.

    • Just hover your cursor over the image and click the Magnifier button ("View original") in the top left corner.

  5. Original Prusa i3 MK3/MK2.5 MMU 2.0 has most of the 3D printed parts marked with their version.
    • Original Prusa i3 MK3/MK2.5 MMU 2.0 has most of the 3D printed parts marked with their version.

    • In case you have issues while printing or assembling certain printed part, please try to find this label and tell it to our support team.

    • Printed parts in the picture are used as an example, yours will be different.

  6. All parts necessary to finish this upgrade are included in the kit.
    • All parts necessary to finish this upgrade are included in the kit.

    • In case some parts get broken during the assembly, you can reprint them. Please check all plastic parts before starting your build to make sure there are no issues.

    • The package with all MMU 2.0 STL files is available at prusa3d.com/prusa-i3-printable-parts/

    • The recommended material is PETG, but you can use also ABS or any material with similar properties to PETG.

    • For printing individual parts, it is recommended to use Slic3r PE with 0.2 mm layer height, GRID infill at 20%, no supports!

  7. Lost in the instructions, missing screws or a cracked printed part? Let us know! You can contact us using following channels:
    • Lost in the instructions, missing screws or a cracked printed part? Let us know!

    • You can contact us using following channels:

    • Using comments under each step.

    • Using our 24/7 live chat at shop.prusa3d.com

    • Writing an email to info@prusa3d.com

  8. Building a 3D printer is a challenge unlike any other and you should treat yourself for every milestone you reach. That is why a bag of Haribo Bears is included!
    • Building a 3D printer is a challenge unlike any other and you should treat yourself for every milestone you reach. That is why a bag of Haribo Bears is included!

    • The biggest issue from the previous builds (MK3, MK2/S) which we had to address was inadequate bear consumption. Many of you didn't have enough bears for all chapters, some even ate them all before they started!

    • I'm glad to announce that after countless weeks of academic research (hundreds of eaten bears), we came to a solution! Thank us later ;)

    • At the end of each chapter, you will be told a specific amount of bears to consume.

    • Eating more or less bears than prescribed in the manual might lead to fatigue or nausea. Please consult a professional in the closest candy store.

    • Hide the Haribo for now! From our experience an unattended bag with sweets tends to suddenly disappear. We are currently investigating this phenomenon.

  9. Extruder parts for MK3 and MK2.5 were upgraded from version B6 to B7. There is a significant improvement to the temperature management. Previous design has a grill on one side of the extruder body. This iteration has a label B6 (printed by us) or R2 (available on GitHub). The latest design has NO grill to improve airflow. This iteration has a label B7 (printed by us) or R3 (available on GitHub).
    • Extruder parts for MK3 and MK2.5 were upgraded from version B6 to B7. There is a significant improvement to the temperature management.

    • Previous design has a grill on one side of the extruder body. This iteration has a label B6 (printed by us) or R2 (available on GitHub).

    • The latest design has NO grill to improve airflow. This iteration has a label B7 (printed by us) or R3 (available on GitHub).

    • All printed parts are included in a separate bag including spare nuts.

    • It is highly recommended to do this upgrade first. Continue here: Upgrading extruder B6 to B7

    • In case you have B7 (R3) already installed, you can skip to the 1. Idler body assembly

Finish Line

143 other people completed this guide.

Jakub Dolezal

Member since: 02/20/2017

225 Guides authored

Team

Prusa Research Member of Prusa Research

Community

3 Members

367 Guides authored

10 Comments

Hi Jakub, I just want to be sure before printing the upgraded extruder parts. Are these also included in the mmu 2.0 kit?

Rui A Vasconcelos - Reply

Hi Rui, all printed parts for the extruder upgrade B7/R3 are included together with spare fasteners. No need to print anything on your own ;)

Jakub Dolezal -

Hello. I’ve upgraded my extruder r2 to r3. While building mmu2 I cracked the Idler bearings assembly while attaching it to motor shaft. Their are two M3nS nuts that attach idler pulley to motor shaft. I ofc over torqued them and ended up cracking the plastic. Need to reprint idler. I looked here:

https://www.prusa3d.com/prusa-i3-printab...

didnt see the stl’s

Khalil Nurullah - Reply

Hi Khalil, parts will be available at “printable-parts” soon, sorry for the issues ;)

Jakub Dolezal -

PJR from forums helped me. Linked github.

Khalil Nurullah - Reply

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