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1. Introduction

1. Introduction
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Last updated 3 years ago
1. Introduction
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Preparing MK2.5S upgrade kit
Preparing MK2.5S upgrade kit
Welcome to the tutorial how to upgrade your Original Prusa i3 MK2/S to Original Prusa i3 MK2.5S
MK2S to MK2.5S upgrade is no longer being supported nor sold as a kit. Please see this article about current upgrading options for MK2/S and MK2.5 printers.
Please prepare MK2.5S upgrade parts received from Prusa Research.
The items on the picture might differ from yours.
WARNING: This assembly guide is valid ONLY FOR SINGLE MATERIAL MK2.5S!!! For MK2.5S MMU2S, please follow Original Prusa MMU2S Upgrade. Different parts are needed!
Getting the necessary tools
Getting the necessary tools
For the MK2.5S upgrade you will need:
Needle-nose pliers (1x)
Allen key 2.5 mm
Allen key 2.0 mm
Allen key 1.5 mm
Slotted screwdriver for the belt insertion
No soldering is required.
No wire crimping is required.
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 :-)
For the most common screws, nuts and PTFE tubes. You can also use the enclosed letter, which contains Prusa Cheatsheet on the other side.
You can download the Prusa Cheatsheet. Print it at 100 % and don't rescale it, otherwise, it won't work.
View high resolution images
View high resolution images
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.
Printed parts - versioning
Printed parts - versioning
Most of the 3D printed parts on Original Prusa i3 MK2.5S are marked with their version.
Cx series (e.g. C1) - those parts are printed on Prusa Research farm and are distributed with the kit.
Rx series (e.g. R4) - those parts are available for download and printing by the user. They are identical to the factory ones.
In case you have issues while assembling the printer with the certain printed part, please try to find this label and tell it to our support team.
Printed parts - self printing
Printed parts - self printing
Printed parts - self printing
Before we start disassembly, you need to print all the necessary parts. If you already have the parts, you can skip to the next step.
For MK2/S to MK2.5S upgrade you need to print the extruder parts, which are separated into more G-codes. Use enclosed BLACK PETG or similar material. The colour should be black to avoid issues.
G-codes and STL files are available on our website: prusa3d.com/prusa-i3-printable-parts
For printing individual parts it is recommended to use Slic3r PE with 0.2 mm layer height, GRID infill at 20%, no supports!
Fan-shroud must be printed from ABS only!!! We include this part in the upgrade package.
Pictures does not represent all the parts.
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.
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.
Most important: Enjoy the build, have fun. Cooperate with your kids, friends or partners. However, we take no responsibility for possible fights ;)
READY? You can start by assembling Y-axis in the next chapter - 2. Disassembly
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