Original Prusa i3 MK3S kit

The Original Prusa I3 MK3S is the successor of the award-winning Original Prusa i3 MK2 3D printer. With the rebuilt extruder, a plethora of sensors and the new magnetic MK52 heatbed with replaceable PEI spring steel print sheet we believe that we've developed our best 3D printer yet!  

This listing is a DIY KIT for self-assembly. We also offer a fully built and tested 3D printer.

Warning for US customers: If you select the combination with both steel sheets, your order will exceed $800 (with shipping) and you may be charged with customs duties. More info.

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IN STOCK! 3 days for preparation, 3-6 days for combined orders


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After more than a year of a continuous development of the Original Prusa i3 MK3 we are introducing MK3S - the enhanced and improved revision of the MK3.



The previous sensor didn’t work well with some specific filaments. The new sensor is using the optical sensor which is triggered by a simple mechanical lever. This sensor doesn’t care about the optical properties of the filament and cannot die because of mechanical wear.


Thanks to completely reworked extruder changing the nozzle or PTFE tube is easier than ever before. As a bonus, the nozzle and the extruder motor is much closer to the X axis, this means less resonance and better prints too. MK3S is also better for printing from flexible materials.


MK3S includes all the cumulative upgrades from the entire life cycle of the MK3 like genuine Gates belts, textile sleeves, a new Einsy case for easier Raspberry Pi connection, an anti-rust coating on smooth PEI sheets and, of course, dozens of firmware and plastic parts enhancements.

The Original Prusa i3 MK3/S is the "Best 3D printer" according to All3DP.com and MAKE: Magazine, where MK3/S also received "Editor's Choice" as the highest-rated 3D printer in 2019 Digital Fabrication Guide. The MK3S features a rebuilt extruder, numerous sensors, and various smart features. Plus, a new magnetic MK52 heatbed with replaceable PEI spring steel print sheet. Dozens of various tweaks and upgrades improve the reliability and ease of use. MK3S‘s functionality can be further expended with the unique Multi-Material Upgrade 2S addon for printing with up to 5 materials simultaneously.


The most significant features of Original Prusa i3 MK3S


The new MK52 Magnetic HeatBed holds a replaceable alloy spring steel sheet with a PEI surface. You can choose between two types of sheets - smooth PEI sheet (default option, already available) and textured powder coated PEI (this will be available later). 


With the MK3S we are introducing the reworked Y axis from aluminum extrusion. It provides the same rigidity as some other printers while providing the sleek look of our milled Dural frame. The frame is also optimized to add 10 mm of Z height totaling at 210 mm.


Thanks to the new Trinamic2130 drivers and Noctua fan, the MK3S is extremely quiet in the stealth mode. But the MK3S is quieter than 99 % of the available printers, even in the Normal mode. In normal mode, we have also increased the printing speed. Now you can achieve more than 200 mm/s!


Have you ever tripped over the extension cord and lost a 20-hours print? MK3S will save you! The printer can fully recover from the loss of power. It detects power interruption and shuts down the heatbed and extruder heating. After restoring the power, you can continue with printing.


With MK3S we are introducing a completely reworked extruder with a new filament sensor. The new sensor is using the optical sensor which is triggered by a simple mechanical lever. This sensor doesn’t care about the optical properties of the filament (it can be completely invisible) and cannot die because of mechanical wear.


The new EINSY RAMBo motherboard with Trinamic drivers not only makes the MK3S silent but it also can detect skipped steps and layer shifting. This is a big step forward in the reliability of the printer and the user comfort. You can say goodbye to ugly prints!


The extruder has now upgraded with Bondtech drive gear. It grips the filament from both sides, increasing the push force and making the printer more reliable. This is useful especially for flexible filaments. Also, the print fan now cools part from two sides, increasing the overall performance.


MK3S has two new thermistors. The first one measures ambient temperature on the electronics, preventing MINTEMP errors in rooms with 15°C or less. The second one is embedded in the new P.I.N.D.A. 2 probe to compensate for temperature drift. So the first layer will always be spot on!


E3D V6 is market-leading all metal hotend well known for its high-temperature performance. The MK3S utilizes a custom heatbreak developed together with E3D. The reliability has proved in our Multi Material upgrade and continues to deliver great performance in surprisingly small form factor.

Read more about features of our brand new Original Prusa i3 MK3S in the article at PrusaPrinters.org

Check out the official announcement video!


"MK3 - highly recommended. I'm really looking forward to everything this printer does becoming standard everywhere." - more infoThomas Sanladerer
"In short. What I don't like about this printer? The rubber feet. What I like? Absolutely everything else!" - more info 3D Maker Noob
"With it's combination of useful new features, along with the reliability and quality of the prints, this is a 3D printer that, especially in the kit form, offers a great price-performance ratio." - more info GreatScott!
"Using this 3D printer has been a joy and an education. (...) The Original Prusa i3 MK3 is highly, thoroughly, and unreservedly recommended." - more info ALL3DP.com


MK3 interview with Josef by Thomas Sanladerer

MK3 interview with Josef by 3D printing nerd

Josef's improvised presentation of MK3 features

EINSY RAMBO interview with Josef



  • Removable magnetic spring steel sheet with PEI surface (*)
  • Brand new EINSY RAMBo motherboard
  • Silent Trinamic drivers with 256 microstepping
  • Faster printing: 200+ mm/s
  • Sensorless homing for X and Y axes
  • Detection and recovery of shifted layers
  • Improved frame rigidity with aluminium extrusions
  • Power loss detection and recovery
  • Better cooling from both sides of the object
  • Optional WIFI with Octoprint interface included
  • Bondtech extruder drive - filament is driven from both sides
  • IR filament sensor
  • Automatic loading of filament when filament is inserted
  • Both extruder cooling fan and print cooling fan detect RPM. When extruder fan is blocked, the printer will stop to prevent damage of extruder. Same applies for the print cooling fan.
  • Extra silent Noctua fan
  • New P.I.N.D.A. 2 probe with included thermistor - faster temperature calibration
  • Room ambient temperature sensor

* Consumable parts, such as PEI sheets (smooth, textured, etc.) are not covered by warranty as the coatings are designed to diminish over time unless failure has occurred due to a defect in materials or workmanship. Cosmetic damage, including but not limited to scratches, dents, cracks or other cosmetic damage is also not covered by the warranty. Only defective sheets on arrival are covered by warranty.


  • Great build volume11,025 cm3 (25 x 21 x 21 cm or 9,84 x 8,3 x 8,3 in)
  • Integrated LCD and SD card controller (8GB included)
  • 0.4mm nozzle (easily changeable) for 1.75 mm filament
  • Layer height from 0.05 mm
  • Automatic mesh bed levelling
  • Heatbed with cold corners compensation – for warpless 3D printing from any material
  • Automatic skew axes compensation
  • Hassle free PEI print surface - no glass, no glue, no ABS juice
  • Supported materials – PLA, ABS, PET, HIPS, Flex PP, Ninjaflex, Laywood, Laybrick, Nylon, Bamboofill, Bronzefill, ASA, T-Glase, Carbon-fibers enhanced filaments, Polycarbonates...
  • Easy multicolor printing based on layer height
  • 1 kg (2 lbs) silver PLA filament included
  • Kit box dimensions: 11 kg, 42×43×24 cm; 16.5×16.9×9.5 in (D×H×W)
  • Printer dimensions (without spool): 7 kg, 55×40×50 cm; 21.6x15.7x19.6 in (D×H×W)
  • Power consumption: PLA settings: 80W / ABS settings: 120W


Great support

We are an established company founded in 2012, and we work hard to help you start 3D printing as soon as possible. We are providing full 24/7 customer support with live chat and e-mail in several languages. There are also unofficial user groups on Facebook, where makers help each other. You will never be alone in the big world of 3D printing!

The MK3S comes along with a forum support where our ever-growing community can always help, or you can even get in touch with Jo Prusa himself at the very same spot! Check out the forum and regularly updated Knowledge Base!

With 3D printing, buying a printer is just a beginning!

Fun to assemble

Assembling the kit is an excellent first step to the world of 3D printing. You will understand the principles of printer construction and get a huge advantage when you need to solve possible problems and replacements later.

But don't worry. Assembling is quite easy! You don't have to solder at all to build our kit. You don't even have to own a soldering iron. All our cables are cut to length and with professionally crimped connectors. And from the electronics standpoint, the hardest thing will be plugging the connectors to the motherboard.

All of this makes the kit very friendly to younger builders :-)

Best assembly instructions and free 3D Printing handbook

We didn't want to leave anything to chance, so our assembly instructions are pictured to the smallest detail.

See the assembly manual for yourself!

All fasteners and mechanical parts have 1:1 drawing so you can easily find them, and there is no chance of you picking a wrong one. You don't have to be MIT graduate to assemble our kit ;-)

Our fastest customer built the kit in 4 hours! Will you beat him?

Ready to print settings

We provide high print settings with the printer, so you don't have to dive into complex new programs the second you finish the build. You can start printing right away, and this gives you a great head start!

These settings are great for all kinds of objects, not just for a couple of prepared showpieces. After a while, when you're familiar with the printer, you can, of course, dive into tinkering ;-)

We are developing our own slicing software. PrusaSlicer is a feature-rich, frequently updated tool that contains everything you need to export the perfect print files for your Original Prusa 3D printer. But of course, we also have the settings for the third party slicers like Simplify3D, Cura, etc.


One of the most popular features of Original Prusa i3 concept is upgradability. If you buy our 3D printer, you can upgrade it later to the new version, so you don't need to buy the whole new model every two years as you get used to for example with your phone or laptop. :-)

Upgrades are a great way not only for saving money, but also to learn about the construction of the printer's hardware. We are constantly improving our technology. A few years ago there was the Original Prusa i3 3mm which was upgradable to the Original Prusa i3 Plus 1.75mm (MK1). MK1 printer can become MK2S thanks to the next big upgrade and then you can go even for the latest MK3S (or MK2.5S if you wish).

Discount program for Original Prusa i3 kit owners

Our discount program for the Original Prusa i3 kit owners gives you a 5% discount on subsequent orders of selected filaments, including the high-precision Prusament!

How does it work?

To enter the discount program, you only need to purchase your first Original Prusa i3 kit for the full price. After the i3 kit is delivered to you, your Prusa account automatically applies the 5% discount on the selected filaments. So next time you'll be stocking up on filaments you can take advantage of the 5% discount :-). Make sure to be always logged into your Prusa account, to have the discount applied.

Ready for the Multi Material Upgrade 2S

Original Prusa i3 MK3S Multi Material 2S is the unique consumer option to print with up to 5 different materials simultaneously. MMU2S comes with a redesigned body and a new filament loading mechanism. Instead of the previous Bowden system. The motorized selector head has a F.I.N.D.A filament sensor and a built-in blade, which prevents filament jamming.

Multi-material could be your next step in the 3D printing world and MK3S is completely ready for the upgrade.

BTW: Do you know, that you can easily print soluble interface supports with Multi Material upgrade? We have a pretty smart solution for you - check out the video!

Quality guaranteed by Josef Prusa & Prusa Research

Prusa Research is a 3D printing company based in Prague, Czech Republic. It was founded by Josef Prusa, one of the core developers of the Open Source project RepRap, in 2012 as a one-man startup and grows to a 160+ team now.

The open-sourced Prusa i3 design is according to 3DHubs the most used 3D printer in the world.

Today we are shipping more than 6000 Original Prusa i3 printers per month to over 120 countries directly from Prague.

Original Prusa i3 MK3S Original Prusa i3 MK2S Original Prusa i3 MK3S Multi Material Upgrade 2S

Build volume

25 x 21 x 21 cm | 9.84 x 8.3 x 8.3 in25 x 21 x 20 cm | 9.84 x 8.3 x 825 x 21 x 21 cm | 9.84 x 8.3 x 8.3 in

Layer height

0.05 – 0.35 mm0.05 – 0.35 mm0.15 – 0.35 mm

Max travel speed

200+ mm/s100 mm/s200+ mm/s

Max hotend/heatbed temp.

300 °C / 120 °C (572 °F / 248 °F)300 °C / 120 °C (572 °F / 248 °F)300 °C / 120 °C (572 °F / 248 °F)

Print surface

removable magnetic heatbed /
PEI spring steel sheets

heated with cold corners compensation /
PEI hassle free

removable magnetic heatbed /
PEI spring steel sheets

Number of materials (simultaneously)


Supported materials

Any thermoplastic including Nylon and Polycarbonate

Any thermoplastic including Nylon and Polycarbonate

Any thermoplastic including soluble supports - PVA, BVOH...

Special features

Bondtech gears, Noctua fan,
extra silent Trinamic drivers


Direct drive extruder, filament cutter, reduced wipe tower - wipe into infill/object, manual controls, finishing filament scraps

Filament sensor

Yes (IR)


Yes (mechanical)

Power panic




Octoprint compatibility




Advanced sensors

4 thermistors, fans sensor,
shifted layers

2 thermistors

4 thermistors, fans sensor,
shifted layers


automatic 9 points XYZ / skew axes compensation

automatic 9 points XYZ / skew axes compensation

automatic 9 points XYZ / skew axes compensation

Kit price

769€ VAT incl. or $749

619€ VAT incl. or $599

299 € VAT incl. or $299

Assembled printer price

999€ VAT incl. or $999

919€ VAT incl. or $899


E-shop link




Very good kit. Everything fits together perfectly. The printer is beyond doubt. The print quality is absolutely perfect. The printer has grown up. Keep up the good work.

  • 1 out of 2 people found this review useful.

Its a great as heck printer

Juts buy one already, and if you already have one, another wont hurt ,':-)

  • 4 out of 4 people found this review useful.

The only printer you'll ever need

This printer is a ferrari compared to all other printers. It's the best investment you'll ever make when you are looking to buy a 3D printer under €1000.
I also want to say special thanks to the people who created the manual for the assembly kit. It was the best manual I have ever seen, making the assembly a walk in the park. I highly recommend everyone buying the self assembly kit.
You will understand every part of the printer better and it will be easier during maintenance of the printer.

For the people that don't like to tinker with print profiles and just want to plug and play. Again, Prusa MK3S is the way to go. You import an STL file into the PrusaSlicer, choose MK3S model, export Gcode and press start. that's it.

  • 1 out of 1 people found this review useful.

I love this thing!

I've wanted a 3D printer for a long time. I did a ton of reading/watching about 3D printers and figured why get a clone of the original?
The kit went together easily by following the included manual and the prints so far have been flawless.

  • 1 out of 1 people found this review useful.


Congratulations on Josef and his team! You guys came up here with an awesome 3D printer!
I started last year with an Anet A8 assembling kit liked this new hobby with the first day :)
Now, after enough upgrading the A8, I wanted more. And here I am now with a brand new Prusa i3 MK3S kit at home.

5 days! It took ONLY 5 days from order till delivery! By receiving the MK3S kit, I was so happy as a little child at christmas! :)

I enjoyed every minute from the unboxing to the very first start of the printer!

Assembling: Very easy and well explained. But I would recommend to everybody to follow the manual in the internet, because the pictures are bigger and you also can zoom in the pictures.

All parts are separarted in boxes and also in ziplocks. Everything is perfectly labeld even with numbers for your buil-up steps! So nothing can go wrong here.

First start: Follow the instructions for the very first start with calibrations. It is nicely done and well explained. Also you could watch a video with Josef explaining the very start. Whatever you guys prefer! Every way will work out.

Software: In the past I was used to CURA slicer. Now, with the PrusaSlicer, I feel me very comfortable. Because the settings are already well done for each material. But, you can also come up with changes on your own, if needed. But comparing both slicers, I have to say I am prefering the PrusaSlicer. Very good job done by your team Josef!

Once you have ordered a printer here, you will get access to the spare parts shop, as long as you ordered with an account I guess. Here I ordered the powder-coated sheet which is already shipped. Next week I am going to have that nice developed sheet in my hands =] This sheet was crucial for me to come up with some orders here ;)

Also I am totally looking forward to receive the MMU2S! This will be a very nice update for the printer. And I think some great experience to gain with 5 different colors or even materials.

Everything in total, I have to say this printer is worth every euro!

Greetings from Germany
A very satisfied costumer!


  • 2 out of 2 people found this review useful.

Absolute workhorse of a machine

Since assembling this printer it has been an absolute dream to use. It is quite literally set and forget - press print and it just works. No more fiddling around with settings, making sure that everything sticks to the printbed, it just does what it says. Printing PLA, PETG and other specialty filaments such as wood have been super easy - merely changing a temperature and a couple of retraction settings as opposed to the hours of trials with cheaper printers. Very impressed!

  • 2 out of 2 people found this review useful.

An amazing beast

This printer is amazing. I'm coming from a heavily upgraded/modified Wanhao i3 v2.1, and there's really no comparison. The MK3S prints much cleaner, faster, and quieter. The level of resolution you can get is also many times better than the cheap knockoffs that flood the market. The sprint bed is superb, so much easier than having to spatula-scrape a print off. I've had zero issues with it, no need to constantly recheck the bed level, adjust tensions, or replace cheap fans that start rattling (All of which I did with my old system). Overall, if you're wanting to jump into 3D printing, skip the cheap knockoffs, the extra cost for the Prusa MK3S is worth it. Next on my list, the multi-material upgrade!

  • 3 out of 3 people found this review useful.

Awesome as expected!

I was looking for a reliable FDM printer to fabricate parts for DIY projects as well as tabletop terrain or markers. Based on the YouTube reviews and seeing the issues friends have with cheaper FDM printers, I decided to go for the i3 MK3S kit. The order process was smooth, automatically keeping the customer in the picture. Shipment was quick via UPS Express Saver and the kit arrived in good order. I took my time with the assembly, but with the very detailed instructions and some common sense and care I managed my first ever FDM printer assembly to pass the self-test with full points (perpendicular axis).

Now, a day after delivery, the printer is churning out parts I had prepared previously back to back without a hitch.

While my experience is certainly limited, I can only highly recommend this product. Two thumbs up.

  • 3 out of 3 people found this review useful.

Best Investment I've ever made

So 3D printing was something of a dream for me. I'm a scale modeler at heart and also a tabletop war gamer and mini painter. So wanting to make my parts, terrain and minis sounded great, but was deterred form the complexity of it all from the hardware, software and design aspects. My feelings were, "Oh Well, leave up to the experts who understand this stuff...
Well, thank you Prusa I've jumped in feet first on an excellent platform that can grow with me as my expertise and knowledge grows. Building the kit is a must as that's the best way to know your printer part by part and understand it's mechanical workings and takes the fear out of taking it back apart for maintenance or replacing a part or upgrading.

The features and built in calibration tools again make it so easy operate and the Slic3er PE software makes it easy for me to learn about the slicer as well as watching many YouTube videos by Prusa and 3D printing enthusiasts where they take you from their failures to solutions and then to completion of their product.

Thank you Prusa for an excellent Machine and a wonderful support team.

  • 7 out of 8 people found this review useful.

World class printer

Comming from a Anet A8 - acrylic I3 printer also as a kit. After more than a year printing I am hooked this amazing tech.
My choice for a new printer came on the Mk3s kit.
Not only was it fun to assembly, but the well written manual and the online portal made it very easy to put this beast of a machine together.
Its prints very very nice, and it still amazes me. The slicer software is very easy to use. Great for a start printer, but also for pro's. Why, because it works every time.
thumbs up.

  • 6 out of 7 people found this review useful.

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Original Prusa i3 MK3S kit

Original Prusa i3 MK3S kit

The Original Prusa I3 MK3S is the successor of the award-winning Original Prusa i3 MK2 3D printer. With the rebuilt extruder, a plethora of sensors and the new magnetic MK52 heatbed with replaceable PEI spring steel print sheet we believe that we've developed our best 3D printer yet!  

This listing is a DIY KIT for self-assembly. We also offer a fully built and tested 3D printer.

Warning for US customers: If you select the combination with both steel sheets, your order will exceed $800 (with shipping) and you may be charged with customs duties. More info.