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1. Introduction

1. Introduction
Relevant for:
Last updated a year ago
1. Introduction
 Difficulty
Moderate
 Steps
11
 Available languages
CSPLESDEITFRJA

Step 1 Preparing the MMU2S upgrade kit

Preparing the MMU2S upgrade kit
Preparing the MMU2S upgrade kit
Welcome to the tutorial on how to upgrade your single material Original Prusa i3 to Original Prusa i3 with MMU2S.
Directly compatible printers:
Original Prusa i3 MK3S+, MK3S and MK2.5S
Incompatible printers:
Original Prusa MK3 or MK2.5, older MMU2S packages included extruder upgrade, if yours does not, please upgrade first to MK3S+ extruder.
Original Prusa i3 MK2/S (please see this article about upgrading to the unofficial version, MK2.5S+)
Original Prusa i3 MK2/S MMU1 (upgrade is no longer available)

For those upgrading MMU2 to MMU2S, please follow chapters 2 and 3 to rebuild the extruder, then skip to chapter 6 (Step 23), assemble buffer in chapter 7 and calibrate printer according to chapter 8.

Step 2 All the required tools are included

All the required tools are included
All the required tools are included
The kit includes:
Needle-nose pliers (1x)
Philips screwdriver (1x)
Allen key (4x)
Universal wrench (1x) older units include a side wrench 8 mm
No soldering is required.
No wire crimping is required.
The colour of the tools might differ.

Step 3 Use labels for reference

Use labels for reference
Use labels for reference
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.

Step 4 View high resolution images

View high resolution images
View high resolution images
When you browse the guide on help.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.

Step 5 Printed parts - versioning

Printed parts - versioning
Printed parts - versioning
The MMU2S upgrade 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.

Step 6 Printed parts - STL files

Printed parts - STL files
Printed parts - STL files
Printed parts - STL files
Printed parts - STL files
All parts necessary to finish this upgrade are included in the kit. Only exception is that if you are upgrading MMU2 to MMU2S and decided to print the parts on your own.
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 MMU2S STL files is available at prusa3d.com/prusa-i3-printable-parts/
The recommended material is PETG.
For printing individual parts, it is recommended to use PrusaSlicer with 0.2 mm layer height, GRID infill at 20%, no supports!

Step 7 We are here for you!

We are here for you!
We are here for you!
We are here for you!
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 [email protected]

Step 8 Pro tip: inserting the nuts

Pro tip: inserting the nuts
Pro tip: inserting the nuts
Pro tip: inserting the nuts
Pro tip: inserting the nuts
3D printed parts are very precise, however, there still might be a tolerance in the printed part and same goes for the size of the nut.
Therefore it might happen, that the nut won't fit easily in or might be falling out. Let's see, how to fix it:
Nut won't fit in: use a screw with a thread along its entire length (typically: M3x10, M3x18) and screw it from the opposite side of the opening. While tightening the screw, the nut will be pulled in. Remove the screw afterwards.
Nut keeps falling out: Use a piece of tape to fix the nut temporarily in place, as soon as you insert the screw in, you can remove the tape. Using glue isn't recommended as it can partly reach into the thread and you won't be able to tighten the screw properly.
Every time we recommend to use the "screw pulling technique", you will be reminded with Joe's avatar ;)
Parts in the pictures are used as an example.

Step 9 Treat yourself!

Treat yourself!
Treat yourself!
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.

Step 10 How to successfully finish the assembly

How to successfully finish the assembly
How to successfully finish the assembly
How to successfully finish the assembly
To successfully finish the assembly please follow all these:
Always read all the instructions at current step first, it will help you to understand, what you need to do.
Don't follow pictures only! It is not enough, the written instructions are as brief as they could be. Read them.
Read the comments from the other users, they are great source of ideas. We read them too and based on your feedback improve the manual and the entire assembly.
Use a reasonable force, the printed parts are tough, but not unbreakable. If it doesn't fit, check your approach twice.
Eat the gummy bears as instructed! Disobedience won't be tolerated :D
Most important: Enjoy the build, have fun. Cooperate with your kids, friends or partners. However, we take no responsibility for possible fights ;)

Step 11 Select the correct printer type

Select the correct printer type
Select the correct printer type
Select the correct printer type
Select the correct printer type
IMPORTANT: Make sure you have selected correct printer from below!
MK3S+ design with sharp edges and a symbol of an arrow on the top cover. A partial extruder disassembly is required. You have to replace just a few parts. Please follow 2A. MK3S+ extruder disassembly
If you start with the new MK3S+ printer, then follow chapters with this type of printer (chapters “A”)
MK3S/MK2.5S design without "chimney" and one idler screw requires partial extruder disassembly. You have to replace just few parts. Please follow 2B. MK3S/MK2.5S extruder disassembly
If you start with the MK3S/MK2.5S printer, then follow chapters with this type of the printer (chapters “B”)
MK3/MK2.5 design with "chimney" and two idler screws requires complete extruder disassembly. You have to use new printed parts. Please follow 2C. MK3/MK2.5 extruder disassembly
If you start with the old MK3/MK2.5 printer, then follow the chapters with this type of the printer (chapters “C”)
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