Original Prusa i3 MK2 to MK2.5S Upgrade Review – 3 Years On

Upgrade for a 3-year old Original Prusa MK2 and Other Mods


In this article, we will review the MK2.5S upgrade for the Original Prusa i3 MK2, feature add-ons, and briefly check 3rd party upgrades and innovations. I have always been happy with the old version of this preassembled 3D printer and used it heavily for a number of years. However, the introduction of the magnetic PEI sheets and later powder-coated spring steel sheets made me curious about the new features. After visiting the Prusa Research booth at TCT Show in Birmingham and actually holding and bending the magnetic sheet in my hands, it became obvious that I indeed needed this upgrade.


This Guide Covers

Awards Winning 3D Printer

When buying the Original Prusa i3 MK2 I had no idea that it would be named the best 3D printer of the year according to the Make magazine and to the 3D Hubs community. I first saw the machine in action at one of the 3D printing events. Even though a 4-feeder upgrade (MMU) was not available for sale at that time, it felt promising that the manufacturer was trying something new.

Price: $799-1229
Original Prusa i3 MK3
Original Prusa i3 MK3S+
Official Website
Original Prusa Upgrades
Official Website

Years later, the next version MK3S+ scooped even more awards. Prusa Research became one of the most reputable brands in the desktop 3D printer market with its own slicer software PrusaSlicer, and constantly growing file repository Printables.

In the beginning, I was considering buying one more 3D printer for a number of reasons. Firstly, I wanted to try something different. I’ve had a great experience with the DeltaWasp 2040, but wanted to go for a different process or a printer type.

Prusa i3 MK2 Multicolour 3D Printer at DIGICAL Show
Original Prusa i3 MK2 MMU at DIGICAL Show
Photo: Max Funkner

Another reason was that using only one machine was not enough for the workflow. By then I seriously thought of going for an SLA printer. However, after considering my options, I decided to buy the second FDM machine, but a cartesian type. It could utilize the same materials, and save money, space, and time.


Original Prusa i3 MK2 – A Brief Review

Fulfillment time for orders placed in autumn 2016 was a lengthy 6 weeks plus there was a 2-week delay on top of that. Back then Prusa Research didn’t have enough manufacturing capacity. We must admit that the online chat support staff did their job very well. We can only imagine the pressure they must’ve been under at that time of the year. Everyone would like to have a new printer delivered in time for the Christmas break. In comparison, we received the new MK2.5S upgrade, as promised, within 3 days.

In our YouTube video above, we are showing the unboxing, calibrating, changing filament, and the first prints on the Original Prusa i3 MK2. On the first day, I tested two G-code files that came with the manufacturer’s SD card. The results were of brilliant quality. Afterwards, I used files from the STL-sharing websites. By that time it was a pleasant surprise that Simplify3D supported Prusa i3 MK2 and had its default settings for slicing the objects.

Nowadays, Prusa Research has its own sophisticated slicing software PrusaSlicer, and I started using it much more often, especially for complicated projects.

MK2 Upgrade to MK2.5S

Price: $200
Check the availability on the Official Website.

Prusa i3 MK2 and a box with upgrade parts
Prusa i3 MK2 Before Upgrade (to MK2.5S)
©3DWithUs – Photo: Max Funkner

It took me a few days to 3D print all the necessary parts in Prusament PETG, take the old MK2 apart, and reassemble it with the new parts. It took longer than expected as I had some issues with printing new parts and had to wait for the replacement of the old thermistor that was worn out. Our family dining table was invaded for almost 3 days. No living creature got hurt, except for the moral damage from the aesthetically unpleasing eating area.

Original Prusa MK2 to MK2.5S - Upgrading in Process
Original Prusa MK2 to MK2.5S – Upgrading in Process – Dining Table Invaded
©3DWithUs – Photo: Max Funkner

Even though the instructions were clear, I found it challenging to 3D print all the necessary parts using the given G-codes. PETG filament that came with the upgrade didn’t stick well to the old printing bed. On top of this, existing G-codes were set to crowd the build plate with tiny objects, including marking text. The poor machine had a lot of retracting to do on the 1st layer at a high speed. Extra adhesion, slower speed, and several attempts got the job done in the end.


I would recommend Prusa Research team to add an option to buy printed parts as well. In many cases printer is out of order and the upgrade IS the fix.

Messy 3D Print Start
Upgrade to MK2.5S – Near-Fail – 3D Printing Process Paused – Messy Part Cleared
©3DWithUs – Photo: Max Funkner

Again, the instructions and step-by-step guidance were clear. What’s no-one mentioned was the scale of the screwing and unscrewing job. It is highly recommended to use an Allen key that has a proper handle.

Joseph Prusa in Action - Reminding to Use a Screwdriver to Sit the Nuts Properly
Joseph Prusa in Action – Reminding to Use a Screwdriver to Sit the Nuts Properly
(Screenshot: Prusa Research)

I would warn against using an automatic/electric screwdriver. Some of the items are very fragile, and overtightening is very likely to break them, like in one place in particular, during the new extruder assembly, which needed a ball driver Hex or Allen key.


I would suggest to the Prusa Research team that they add a very thin screwdriver to this upgrade package as a freebie, especially for the stepper motor. In any case, if you have this type of 3D printer, I would recommend investing in a set of such ball driver Hex screwdrivers, see an example from Amazon. Basic hex keys usually come with the new 3D printer, but these are not comfortable enough for major assembly or upgrade jobs. Check the other essential recommended tools for FDM desktop 3D printers.

Balldriver Screwdriver
Balldriver Screwdriver – Hex or Allen key – A must-have tool for DIY 3D printer kits
©3DWithUs – Photo: Max Funkner

And the last issue I had was with the thermistor. I didn’t snap it during the initial disassembly-assembly procedure, it got a bit of damage within the past 3 years. Presumably, it mostly happened during changing the nozzle. Hotend E3D thermistors can be bought via the official website in the spare parts section. As I needed it urgently Amazon came to the rescue and delivered the replacement item in 2 days.

E3D Block & Sock V6 Thermistor Upgrade Kit
Hotend Thermistor E3D Kit

Prusa i3 MK2.5S Upgrade for $200 – Was it worth it?

Yes, it was. Since upgrading to MK2.5S we 3D printed a lot of various items: with supports, lithophanes, bulky models, etc. Turning our old Prusa into the one with magnetic steel sheets was one step closer to plug-and-play. Can’t see any big difference when using the new extruder. Maybe this is just because the old extruder performed well, too. But the magnetic steel sheet is truly an addictive feature. In the end, for 3D designers and makers, it is important that 3D printing doesn’t eat much of precious time.

Original Prusa i3 MK2 Upgraded to MK2.5S
Original Prusa i3 MK2 Upgraded to MK2.5S
©3DWithUs – Photo: Max Funkner

Another interesting discovery was that it was possible to use GCodes originally prepared for MK3 printers and these worked well for my upgraded MK2.5S as well. You can find plenty of GCodes for MK3 on Printables, please use such files with caution! Below you can find Sanjay Mortimer’s Commemorative Hex Tile printed using Repkord’s GCode for MK3 printers.

Sanjay Mortimer's Commemorative Hex Tile
Commemorative Hex Tile printed on upgraded MK2.5S
©3DWithUs – Photo: Max Funkner

MK2 Upgrade to MK3S+

Check the availability on the Official Website.
Recently, I noticed that there are no upgrade packages for MK2 to MK3 available anymore, and I am not sure if they will be added anytime soon.

Noise Reduction DIY Tricks

If you don’t plan to buy an Official Prusa Enclosure we feature below, then these DIY tricks may help you with noise reduction. 3D printed Noise Dampers by Hofftari and stone slabs or just a few big heavy tiles.

Noise Dampers and Stone Base
The noise dampers and a heavy stone slab
©3DWithUs – Photo: Max Funkner

Original Prusa Enclosure

Price: $349-571
Official Website
The enclosure is much cheaper when bought as a bundle together with the new 3D printer. Overall, the Original Prusa Enclosure is an essential accessory for anyone who wants to get the most out of their Original Prusa i3 3D printer. Made from high-quality materials, it’s designed to keep printers safe. It has enough space for the MMU2S unit as well.

Original Prusa Enclosure
Original Prusa Enclosure at TCT 3Sixty
Image: Max Funkner

The enclosure helps to control the temperature, reducing the risk of warping, therefore improving the bed adhesion and print quality. This enclosure comes with a $349 price tag. It would cost more when the add-ons are added, like Advanced Filtration System, Mechanical Lock, PSU Cable Quick-release, White LED Strip, or others.


3rd Party Upgrades & Innovations

The ability to upgrade and customize Prusa Research machines, especially MK2/3 and MINI, is one of the main reasons why these are highly regarded in the maker communities. Please have a look and search for a needed build or a mod on Printables. Here is the list of the 3rd party upgrades and innovations that caught our eye.

Automate Your Original Prusa – Quinly for Prusa

The Quinly for Prusa package includes a tilt frame that angles the printer with the bed facing downwards, allowing 3D printed parts to be knocked off and fed into a container without requiring an operator to manually remove them. Unlike a belt-driven system that allows the print bed to also act as a conveyor belt to move parts away from the print area, the tilt frame creates a natural angle for the part to remove itself from the build plate.

Quinly for Prusa i3 MK3 - Tilt Frame
Quinly for Prusa i3 MK3 – Tilt Frame & VAAPR Print Bed
(Image: 3DQue)

Jobox Automation Upgrade for MK3S+

Another automation system is offered by the Jobox team. Jobox launched a Kickstarter campaign, which generated, by the time of updating this post, $30k, and the goal was to create an automation upgrade for Prusa MK3S+. The upgrade was highly praised on social media and Jobox even managed to feature the system at Formnext.

Jobox Automation Upgrade for Prusa MK3s+
Jobox Automation Upgrade for Prusa MK3s+ at Formnext
Photo: Max Funkner

Creative Mods by the Community

Entirely new ideas and remarkable custom mod builds keep popping up from time to time on social media with users publishing their builds on file-sharing repositories. Creative mods by @neil3dprints are the best examples. Check his Bulbasaur Mini, Tachikoma Mini, and Original Prusa Mate mods for Prusa Mini.

Bulbasaur Prusa Mini 3D Printer
Bulbasaur Mod for the Original Prusa MINI
With the Permission – Photo: @neil3dprints

6 Years On – Conclusion and Links

Inspired by Thomas Sanladerer’s video about a 5-year old Original Prusa MK3, I decided to update an old article about the MK2 upgrade. As the result added a lot of interesting stuff.
This article was updated 3 years later and 6 years later, and the upgraded Original Prusa i3 MK2 still lives and performs. The most recent 3D print job was for the #yellowribbon3Dprint mental health campaign by Abby Brown, see the image below. Still good to use when color changing is involved and in many other cases.

Yellow Ribbon Keychain 3D Prints
#YellowRibbon3DPrint with two color changes – Printed on a 6-year old upgraded Original Prusa i3 MK2.5S
©3DWithUs – Photo: Max Funkner

Original Prusa i3 MK3
Original Prusa i3 MK3S+ (New version)
Official Website
Original Prusa Upgrades
Official Website

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