Skip to main content
  1. Welcome to the tutorial how to upgrade your Original Prusa i3 MK2/S to Original Prusa i3 MK2.5S
    • Welcome to the tutorial how to upgrade your Original Prusa i3 MK2/S to Original Prusa i3 MK2.5S

    • Please prepare MK2.5S upgrade kit 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 i3 MK3S/MK2.5S & MK3/MK2.5 to MMU2S. Different parts are needed!

  2. For the MK2.5S upgrade you will need:
    • 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.

  3. 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.
    • 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 Prusa Cheatsheet from our site. Print it at 100 %, don't rescale it, otherwise it won't work.

  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. Most of the 3D printed parts on  Original Prusa i3 MK2.5S are marked with their version.
    • 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.

  6. 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.
    • 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.

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

  9. 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.
    • 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

Finish Line

56 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

One Comment

Having ordered the Mk2 to Mk 2.5 and the MMU upgrades means we have received some of the printed parts for the 2-2.5 upgrade with the MMU kit.

Looking at the STL printed parts for the 2-2.5 upgrade there are various similarities and differences. It looks as though we need to read all the instructions to determine if we need to print any parts before commencing the upgrades (rather than printing stuff we then throw away).

gstroot@gmail.com - Reply

Add Comment

View Statistics:

Past 24 Hours: 11

Past 7 Days: 73

Past 30 Days: 334

All Time: 2,858