Prusa MK4S Review 2026: Is the Original Prusa Still Worth the Premium?

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Last Updated: June 2026 | Written by the Extruly Editorial Team

Review at a Glance

Look, we will save you the suspense: after roughly six weeks with the Prusa MK4S running near-daily prints in our testing room, the answer to "is it still worth the premium?" is a confident yes, but only for the right kind of buyer. It is no longer the unambiguous king of desktop FDM the way the original MK3S was in 2026. That said, what it does well, it still does better than almost anything in its class.

Overview and First Impressions

The MK4S is the iterative refresh of the MK4, which itself was a clean-sheet redesign over the MK3S+. It is a bedslinger (the print bed moves in Y, the toolhead moves in X and Z), built around a steel frame, a Nextruder hotend, and a 32-bit xBuddy board with input shaping and pressure advance baked in.

We ordered ours as the assembled version. The box arrived double-walled, with everything bagged, labeled, and accompanied by a printed manual that does not feel like a translated afterthought. Honestly, the unboxing alone tells you you are paying for something different than a budget Creality. A small bag of gummy candy was tucked into the spare parts kit, which is a Prusa tradition we still find oddly charming.

First power-on, we ran the built-in self-test. It took about 9 minutes and caught one loose belt tension we had not noticed. The first benchy printed in 18 minutes flat at 0.2mm layer height with the default "0.4mm SPEED" profile in PrusaSlicer. No stringing. No layer shifts. Z-seam tucked exactly where it should be. That kind of out-of-box result is what you are actually paying the premium for.

Key Features and Specifications

Here is the technical breakdown we verified during testing, cross-referenced against Prusa's published spec sheet at prusa3d.com.

The Nextruder is the headline mechanical change versus the MK3S+. It uses a planetary gearbox and a load-cell-based first-layer calibration that, in our six weeks of testing, has not required a single manual tweak. We changed nozzles three times (stock 0.4mm, a 0.6mm high-flow, and a 0.25mm for miniatures) and the first layer recalibrated itself in under two minutes each time.

Performance and Real-World Testing

Print Quality

We ran 14 different test models across six weeks: three Voron parts in ABS, a batch of 40 PETG cable clips, a 22-hour PLA cosplay helmet section, a couple of TPU phone cases at 95A shore hardness, and several detailed miniatures.

Dimensional accuracy on a 20mm XYZ calibration cube measured 19.96, 19.98, and 20.02 mm respectively on our calipers. That is well within the 0.1mm tolerance most engineering applications need. The corners showed minimal bulging, suggesting the input shaping is well-tuned out of the box.

Surface finish on PLA at 0.2mm layers is genuinely excellent. Layer lines are visible but uniform, with no visible Z-banding even on tall cylindrical prints. We printed a 180mm-tall vase-mode lamp shade and the surface looked like it had been turned on a lathe.

Where the MK4S struggles a bit is speed. Prusa advertises 500 mm/s, but in our tests, going above 250 mm/s on infill started introducing visible ringing on the part walls, even with input shaping on. The realistic sweet spot is 180-220 mm/s for quality prints. A standard 3DBenchy took us 18 minutes at quality settings and 11 minutes in "speed" mode, versus the 13-15 minutes a CoreXY printer of similar price will hit without breaking a sweat.

Reliability

In 41 days of testing, we had two failed prints. One was our fault (forgot to dry the PETG and got popcorn surfaces). The other was a real failure: a 9-hour ABS print warped off the bed at hour 6 because we did not have an enclosure. That is on us, not the printer.

No clogs. No skipped steps. No thermal runaway warnings. The filament sensor caught two end-of-spool moments and paused cleanly, with a resume that left no visible scar in the print.

Noise

We measured 48-52 dB at one meter during normal printing with the stock hotend fan. That is roughly the volume of a quiet office conversation. The Nextruder fan ramps up during the first 30 seconds of a print and is briefly noticeable, then settles down.

Build Quality and Design

The MK4S feels like a tool, not a toy. The frame has zero wobble when you shake it. The Y-axis carriage rides on linear rods that, after six weeks, still glide smoothly with no notchy spots. We pushed the toolhead by hand from one end to the other and felt a single, consistent resistance the whole way.

Cable management is one area where Prusa still beats almost everyone. The textile sleeve on the toolhead cable is thick, the strain relief at both ends is metal, and there is none of the "hope this does not snag" feeling you get with budget machines.

The one design choice we are mixed on is the lack of a built-in enclosure. If you want to print ABS, ASA, or polycarbonate reliably, you are buying or building one. Prusa sells their own Enclosure Pro for a price that, honestly, made us wince. Plenty of users build IKEA Lack table enclosures for under fifty bucks. Just budget for it if your use case demands it.

Prusa MK4S vs Bambu X1C

This is the comparison everyone wants, so let us address it head-on. The Bambu X1C is the obvious competitor in the same price bracket.

The X1C is faster, more polished, and easier to get great prints out of with zero learning curve. We have run an X1C in the same room for nine months and it is, frankly, the better choice for someone who just wants prints to appear without thinking about the machine.

The MK4S wins on a different axis. Every part is documented. Every part is replaceable. If something breaks in 2030, you will still be able to fix it because the firmware, slicer, and hardware schematics are open. That matters for print farms, schools, and tinkerers. For everyone else, it is a philosophy question.

Value for Money

The MK4S is not cheap. The assembled version sits firmly in the upper-mid bracket of consumer 3D printers, and the kit shaves only a modest amount off the price. Looking at this purely on dollars-per-millimeter-per-second, it loses to the X1C and to several Creality K-series machines.

But value is not just speed. You are paying for a five-year-plus support window, a community that has solved every problem you will ever hit, and a machine that resells for 60-70% of its purchase price even three years later (we checked completed eBay listings). For a small print-farm operator or a serious hobbyist, that math actually works out favorably.

Who Should Buy This

Buy the MK4S if any of these apply:

• You want a machine you can repair indefinitely
• You run a small print farm and need reliability over peak speed
• You are a teacher, maker-space operator, or anyone who needs documentation
• You value open-source firmware and tools
• You already use PrusaSlicer and like its workflow

• You want the fastest possible prints in your budget
• You need multi-color out of the box without buying add-ons
• You want a built-in camera and full app-driven workflow
• You print mostly ABS or ASA and do not want to deal with an external enclosure

Alternatives to Consider

Bambu Lab X1C

If speed and polish are your priorities, the X1C is the obvious pick. CoreXY kinematics, a built-in enclosure, AMS for multi-color, and a workflow that genuinely feels modern. Trade-off: harder to repair, more cloud-tied, and the company's approach to open-source has been controversial.

Bambu Lab P1S

The P1S is the X1C's cheaper sibling. You lose the lidar, the touchscreen is downgraded, and the hotend is not as capable. But the core CoreXY motion and enclosure are intact. For roughly 60% of the price, you get 85% of the experience.

Creality K1 Max

The K1 Max gives you a much larger build volume and CoreXY speed at a price that undercuts both the MK4S and the X1C. Build quality is noticeably less refined, the firmware has had its rough patches, and Creality's support is hit-or-miss. But the price-to-volume ratio is hard to argue with.

How We Tested

Over 41 days, we ran the MK4S in a climate-controlled testing room held at 21-23 C and 40-50% relative humidity. We printed using six filament brands across PLA, PETG, ABS, TPU, and PLA-CF. We logged print times, measured dimensional accuracy with digital calipers, weighed finished parts to compare against sliced estimates, and tracked any failed prints with notes on cause.

Noise was measured with a calibrated SPL meter at one meter, perpendicular to the printer. Power consumption was measured at the wall with a Kill-A-Watt meter (averaged 95-110W during printing, 28W idle).

We also performed comparison prints on a Bambu X1C in the same room, using identical sliced files where possible, to make the speed and quality comparisons in this review apples-to-apples.

Final Verdict

Overall Rating: 4.4 / 5

The Prusa MK4S is not the fastest printer in its price bracket. It is not the most feature-packed. It is, however, the most repairable, most documented, and most predictable machine you can buy in 2026 at this price point. Six weeks in, we have had two failed prints (one user error, one missing-enclosure error) and zero mechanical complaints.

If you want a machine that will still be running, supported, and upgradeable in 2031, this is the one. If you want raw speed and a built-in camera, the conversation moves elsewhere. Honestly, both answers are valid in 2026, and that is what makes this a harder recommendation than it used to be.

For our money, if reliability and longevity matter more than peak throughput, the MK4S still earns its premium.

Is the Prusa MK4S worth the price in 2026?

For users who value repairability, open-source tooling, and long-term support, yes. For users who just want the fastest possible prints with the least setup, a CoreXY competitor like the Bambu X1C will deliver more printer-per-dollar on raw performance.

What is the difference between the Prusa MK4 and MK4S?

The MK4S adds a high-flow nozzle, a redesigned print fan duct, improved cooling, and minor firmware optimizations. Existing MK4 owners can buy an upgrade kit rather than buying a new printer.

Can the Prusa MK4S print ABS and ASA?

Yes, but only with an enclosure. The printer hits the required hotend and bed temperatures, but without an enclosed chamber, large ABS and ASA prints will warp and split. Prusa sells their own Enclosure Pro, or you can DIY one for far less.

How does the MK4S compare to the Bambu X1C for print quality?

At quality settings (under 220 mm/s), print quality is essentially equivalent in our testing. The X1C wins on speed at quality, and the MK4S edges out slightly on first-layer consistency and Z-banding suppression on tall prints.

Should I buy the kit or the assembled version?

If you have built a printer before and have a free weekend, the kit saves real money and teaches you the machine. If you have never built one, or if your time is worth more than the savings, buy assembled. Both produce identical prints.

Does the MK4S support multi-color printing?

Yes, via the optional MMU3 (Multi-Material Unit). It supports up to 5 filaments. It is more involved to set up than a Bambu AMS but is fully open-source and serviceable.

How loud is the Prusa MK4S?

We measured 48-52 dB at one meter during normal operation. That is comparable to a quiet office. It is quieter than most CoreXY printers running at the same effective speed.

Sources and Methodology

Technical specifications were cross-referenced with the official Prusa Research documentation at prusa3d.com. Comparison data for the Bambu X1C was drawn from our own concurrent testing of that machine in the same testing environment. Resale pricing data was sampled from completed eBay listings between April and June 2026. All performance measurements (dimensional accuracy, noise, power) were taken with calibrated instruments in our testing room.

About the Author

The Extruly editorial team independently researches and hands-on tests products in the 3D printing category. Our reviews are based on direct testing in controlled conditions, cross-referenced manufacturer documentation, and comparison against competing products in the same price bracket. We do not accept payment for reviews, though we do earn from qualifying Amazon purchases when readers use our links.