Original Prusa MK4S Kit 3D Printer

Note: This offer is targeting US-based educational and government institutions that must buy from U.S.-based companies and are unable to buy directly from Prusa Research a.s., a foreign entity. As per Prusa's reseller guidelines, Top3DShop acquires this product at retail prices from Prusa and then resells it to U.S.-based educational and government entities with added markup, ensuring compliance with your local procurement regulations. In addition, Top 3D Shop offers local customer support, customs clearance handling, and favorable financing options and NET 30 terms for eligible EDU, GOV and business customers.

The Original Prusa MK4S is the latest iteration of the Prusa’s flagship FDM 3D printer series aimed to withstand non-stop operation with minimal downtime. The machine features a completely redesigned cooling system alongside a number of reliability upgrades, improved components, and easier maintenance. The printer looks similar to the original MK4 model, featuring the same Cartesian kinematics, die-cast aluminum frame, 0.9° low-inductance stepper motors that help eliminate vertical fine artifacts, and thicker 10-mm rods on the Z-axis. However, the MK4S has been engineered with a new 360° cooling system, high-flow nozzle, improved firmware and tweaked print profiles enabling extremely fast printing with the same brand quality and reliability.

There are two versions of the Original Prusa MK4S available, which are a DIY kit and an assembled modification.

Compared to the Original Prusa MK4, the MK4S version brings the following innovations:

• New high-performance 360° cooling system
• High-quality high-flow nozzle as standard*
• Native iOS/Android Prusa app for iOS and Android with easy Wi-Fi setup with an NFC tap
• Improved print speed
• Improved print quality
• New parts printed from Prusament PC Blend Carbon Fiber or injection molded
• Optional accessory: GPIO hackerboard
• Optional accessory: accelerometer for printer modders

* With the MK4S/MMU3 bundle, you will receive both nozzles in the package — the standard and the high-flow nozzle. For the assembled MK4S in a bundle with MMU3, the standard nozzle will be pre-installed on the printer by default.

Similar to the predecessor, the MK4S boasts the custom 32-bit STM32-powered xBuddy mainboard with multiple connectivity options, including USB, Ethernet, and Wi-Fi. To ensure safe operation, the mainboard communicates with four thermistors for the hotend, heatbreak, heatbed, and ambient, and has hardware overcurrent protection that disconnects the heater and print bed power if the total current exceeds 15A. The power panic function allows resuming printing after the power outage. Prusa Research has also implemented input shaper and pressure advance technologies into the MK4S. The former helps eliminate resonance in prints, while pressure advance is used to control the filament flow. Both technologies allow for a significant boost in print speed without losing the quality.

To provide a streamlined experience for both beginners and advanced users, the MK4S 3D printer is equipped with multiple quality-of-life features, including a quick-release nozzle system, auto leveling, automatic cold pull, stuck filament detection, easy-to-use removable magnetic PEI platform, intuitive interface, long-term support and updates. In terms of software, the MK4S is powered by the proprietary PrusaSlicer and a new optional native mobile app for remote control. 

Both firmware and PrusaSlicer are open-source, which allows for easier upgrades and custom modifications. The design of Prusa machines provides easy access to all parts without a lengthy disassembly process: no welded or glued parts, everything can be taken apart with a set of Allen keys. Also, getting started with the MK4S is super easy: simply take the printer out of the box, plug it in, perform a quick calibration, and start printing in just 15 minutes!

Due to its increased accuracy, high-speed printing capabilities, robust structure, advanced connectivity options, and plug-and-play design, the Original Prusa MK4S 3D printer is perfect for an ample range of personal and professional applications. Easy to use even for complete beginners, the machine offers reliable performance making it a perfect fit for professional workshops. Thus, the MK4S can be efficiently used in various spheres, from hobby applications to manufacturing, education, architecture and design, automotive, and more.

The MK4S model is fully compatible with the Prusa MMU3 for multi-material printing with up to 5 filaments and the Original Prusa Enclosure for printing with temperature-sensitive thermoplastics. For enthusiasts and modders, the manufacturer offers two new optional accessories — the GPIO “hackerboard” and accelerometer add-on.

Specifications:

• Print quality
• Materials
• Build volume
• Printer controls and software
• What’s in the box
• Add-ons
• Look and feel
• Price

Print quality

Excellent print quality has always been one of the strong points of Prusa 3D printers, and the MK4S is not an exception to the rule. Numerous advanced technologies allow the machine to create impeccable models with smooth surface finish and sharp features at an impressive speed, with a minimum layer height of 0.05 mm. 

One of the most prominent features of the MK4S 3D printer is the extruder, or Nextruder, which is a smaller and lighter version of the one used on the Prusa XL model. It is equipped with a load cell sensor that eliminates the need for manual Z-height adjustment and ensures what the company calls “always perfect first layer”. The quick-swap nozzle design with two thumbscrews allows for easy nozzle replacement.

Alongside other improved parts, the new high-flow nozzle of the MK4S model melts more material in the same amount of time resulting in increased volumetric flow without sacrificing quality for quicker print times. The machine comes with a standard 0.4 mm nozzle which can be easily replaced with 0.25–0.8 mm for your particular needs. The manufacturer offers a Nextruder-to-V6 adapter that allows using any E3D V6-compatible nozzles with the MK4S.

In combination with the high-flow nozzle, the printer’s new cooling fan with a powerful turbine and 360° air delivery provides excellent layer adhesion, making your prints strong and durable. A wide array of print profiles, including new fast ones, as well as optimized firmware make the results with the MK4S both quick and flawless.

Furthermore, thanks to the 360° cooling system, the machine allows one to print overhangs of up to 75° without supports, which significantly reduces print costs and time. This also simplifies printing flexible materials like TPU, where removing supports is often a challenge.

Materials

The maximum nozzle temperature of 290 °C and the 120 °C heated print bed make the Original Prusa MK4S compatible with a wide range of filaments such as PLA, PETG, ASA, flexible TPU, carbon-filled filaments, and others. The printer can process both proprietary Prusament and third-party filaments, providing the user with a wide choice of available 1.75 mm thermoplastics.

Check out the Add-ons section to learn more about working with advanced materials, such as ASA, ABS, PC, etc., and print with up to 5 colors or materials with the single-extruder MK4S.

Build volume

The Original Prusa MK4S features a build volume of 9.84 x 8.3 x 8.6 in (250 x 210 x 220 mm), which is 10 mm more on the Z-height than the Original Prusa MK3S+, due to the more compact extruder. The magnetic heated print bed with removable PEI spring steel sheets allows for good first layer adhesion and easy print removal. The machine comes standard with a Smooth PEI sheet, and the user can additionally purchase Satin and Textured PEI sheets.

Printer controls and software

The Original Prusa MK4S 3D printer is controlled via a 3.5" full-color graphic LCD with G-code thumbnails, QR-codes, graphics, and longer text support. The navigation is performed with a rotary knob. The UI is customizable, allowing the user to select up to five options in the footer of the main screen, such as temperatures, fan speeds, and print speed. There is a programmable RGB status bar under the screen to show the current status of the printer. Next to the LCD, there is a USB port.

Thanks to the new xBuddy mainboard enabling Ethernet and Wi-Fi connectivity, one can seamlessly control the MK4S 3D printer remotely via a web browser. This lets managing the printing process from anywhere using the secure Prusa Connect system or an optional mobile app. The latter allows you to print directly from Printables (Prusa’s database of free 3D models), get notified about filament changes, and set up Wi-Fi with a simple tap with NFC.

For maximum security, the printer can also operate in a fully offline mode. The MK4S can be configured and updated completely without internet access. The Wi-Fi module can be easily unplugged for environments that require the highest level of security.

The MK4S model is recommended to be used with the open-source PrusaSlicer software with numerous useful tools such as organic supports, cutting, automated object distribution, ironing, and others. The program features timely updated and ready-to-use material profiles (over 180 in total) that ensure perfect print results with different filaments and cut down print preparation time.

What’s in the box

• Original Prusa MK4S Kit 3D printer
• Smooth PEI print sheet
• Spool of filament (Prusament PLA Prusa Galaxy Black 1kg)
• USB drive with sample prints (G-codes)
• Toolset: Uni-wrench, 13–16 wrench, Nose pliers, Allen and torx keys
• Alcohol-saturated wipes, acupuncture needle
• Spool holder
• Prusa lubricant for bearings
• 3D Printing Handbook

For some items, package content may change. In case of any questions, please get in touch.

Add-ons

One can extend the capabilities of the Original Prusa MK4S 3D printer and increase convenience of use by purchasing the following add-ons provided by the manufacturer (check out the Add-ons & Extras section at the top of the page to add them to your shopping cart).

MMU3

The MK4S model can be enhanced by an optional add-on that allows you to print with up to 5 colors or materials at the same time. The MMU3 is the fastest single-extruder multi-color system that is up to three times more efficient in managing filament waste compared to other similar modules, bringing substantial cost savings.

With all-new plastic parts, reinforced metal parts, and firmware built from the ground up, the MMU3 system delivers high-quality multi-material prints faster than its competitors. With 25–35 seconds per filament change and optimized nozzle cleaning, the printing process is much more rapid, smooth, and reliable.

It is recommended to use the standard MK4S nozzle instead of the high-flow one since the increased volumetric flow results in higher filament waste during printing.

Enclosure

The Enclosure add-on stabilizes the MK4S environment, eliminates drafts and odors, and makes the printer even more silent. Note that most common materials, such as PLA, PETG, and even some advanced ones (like PCCF) do not require an enclosure. However, once you need to print with more advanced materials, such as ASA, ABS, PC and similar, the Enclosure is the best option to achieve increased temperatures in a stabilized environment.

The Original Prusa Enclosure is available with a range of useful add-ons, such as the Advanced filtration system with HEPA filter, LED strip, Mechanical Lock or Fire Suppression System.

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