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In this guide
The MK4S arrives as a kit of parts to build into the printer. Prusa also sells the same machine assembled. The kit is $709 by its structured price and $657.40 in the cart on October 17; the assembled version is $925. Both were in stock.
Kit or assembled is not a hobby question. The warranty terms differ, and so does responsibility when something fails: on a kit, the builder's own work is part of the machine. Prusa sells both, so the question is priced rather than hypothetical.
Our verdict
Buy the $709 kit if assembly is the point and you will print PLA, PETG or PC. A buyer who has to print tonight should pay $925 or buy elsewhere.
- A good fit for
- A maker curious about the machine, will print PLA, PETG and PC, and prefers to replace a part than ship a printer back.
- We would skip it if
- Anyone planning ABS or ASA without buying the enclosure, wants a printer running the same evening, or expects the warranty to cover repair labor.
Reasons to consider it
- 250 × 210 × 220 mm, 0.05 to 0.30 mm layers, a 290 °C hot end and a 120 °C bed, with a 0.4 mm high-flow brass CHT nozzle.
- Loadcell and filament sensors, power panic, mesh bed leveling over the print area, a 3.5-inch screen, USB and an included Wi-Fi module.
- Prusa's spare-parts shop lists MK4S parts, and the assembly manual is published as a document of its own.
- The warranty can be extended by one or two years, but only when bought with the printer.
The compromises
- One year outside the EU; on a kit the cover is per component and excludes repair service and shipping to Prusa's technicians, with factory repair charged.
- ABS, ASA, HIPS and PA need the Prusa Enclosure and its filtration add-on, both bought separately.
- Damage from improper assembly or long-term skipped maintenance voids the warranty, and the builder is the one assembling.
- The page shows two prices, $657.40 in the cart and $709.00 in its structured data, so confirm the total at checkout.
What we have not verified: Prusa publishes no assembly hours for the kit, and its 15-minutes-to-first-print line leaves open whether the build is included. No independent print-quality comparison between the MK4S and the A1 or P1S is cited.
The things in this guide
A closer look at the products, who they may suit, and what to check before buying.
Original Prusa MK4S · Kit
A 250 × 210 × 220 mm build volume, a 290 °C Nextruder, loadcell and filament sensors, power panic, and MK4S parts sold in Prusa's spare-parts shop.
Before you buy: The US warranty is one year and, on a kit, excludes repair labor and shipping; ABS, ASA, HIPS and PA need the enclosure, and assembly hours are not published.
Price checked October 17, 2026. Retailer prices can change.What is in the box, and what it costs in hours
The assembly manual that turns those parts into a printer is published as a document of its own on Prusa's knowledge base.
Building it teaches the machine: the parts a later repair touches are ones the builder has already fitted. The cost is time, and Prusa does not put an hours figure anywhere on the kit page.
The 15-minutes-to-first-print line on that page merits two reads. It leaves open whether it refers to the assembled printer or to a build, and a box of parts does not print in 15 minutes.
One year, and what voids it
Outside the EU, the warranty is one year. EU consumers get two. The extension, one or two extra years, has to be bought with the printer at checkout; it cannot be added later, so the decision is made before the machine exists.
On a kit, cover is per component. Prusa's knowledge base says the warranty does not include repair service or shipping to its technicians, and that a factory repair is charged. Damage caused by improper assembly, or by long-term skipped maintenance, voids it. A warranty claim on a kit starts with the builder's own work.
For a buyer weighing kit against assembled, this section decides it: if the build has a mistake, the first year is when it surfaces, and that is also the only year of standard cover.
250 by 210 by 220, and the enclosure caveat
The build volume is 250 × 210 × 220 mm, up from the 180 mm cube of the Bambu Lab A1 mini reviewed here, and it fits a 240 mm bracket or a drone frame in one piece. Layers run 0.05 to 0.30 mm, the nozzle is a 0.4 mm high-flow brass CHT, and the hot end reaches 290 °C over a 120 °C bed.
The spec panel puts the caveat beside the material list. PLA, PETG, Flex, PVA, PC, PP, CPE and PVB print as delivered. ABS, ASA, HIPS and PA need the Original Prusa Enclosure and its filtration add-on. Without them, no car trim and no drone frame that sits in the sun; the MK4/S Enclosure adds $379 by its structured price and $349 in the cart, with the filtration system as another line.
Parts you can order
Prusa's spare-parts shop lists MK4S parts, and the assembly manual names each one, which matters more than any single specification: a printer that can be fixed from a catalog in year three is a different purchase from one that is replaced when a board fails.
The printer takes jobs over USB or through the included Wi-Fi module, and its 3.5-inch screen sits on the frame, so setup does not depend on a phone.
Prusa also runs a 700-machine print farm and says the pre-MK4 fleet accumulated over a million print hours. The number is a maker claim, reported here as such.
$310 more than an enclosed Bambu Lab
Bambu Lab sells the A1 at $299 for the printer and $399 for the Combo, and the P1S at $399 with an enclosed chamber, a carbon filter and ABS and ASA listed as ideal. On paper the P1S does more for $310 less at the Prusa kit's $709 list price, and it arrives assembled.
$310 buys a machine whose parts can be ordered later. Prusa's catalog lists MK4S parts; whether another maker sells an equivalent control board is a separate question, and one worth checking before buying on repairability. That is what the kit sells, and it is worth the money only to a buyer who will use it.
The assembled Prusa sits at $925. Against the $709 list that is $216; against the $657.40 the storefront showed, it is about $268. Either way it removes the build and moves the warranty from components to the finished machine, while still asking for a quick calibration on arrival.
Who should not buy the kit
Skip it if ABS or ASA is on the first month's list, because the enclosure is another purchase and an open frame will not do. Skip it if the printer has to be working tonight, or if a warranty that excludes labor reads as a deal-breaker.
Buy the kit when the build itself is the reason, when PLA and PETG cover the work, and when a parts catalog matters more than the specifications. Buy assembled if the machine is a tool and the build is overhead. Either way, budget the enclosure if ABS or ASA is in the plan.
How we put this together
Built from the product pages and listings below, without test scores or results we have not measured. Specifications and prices change, so check the original page for the exact model, current price, delivery, and returns.
- Prusa Research: Original Prusa MK4S 3D Printer kit product page (US) (opens in a new tab)
- Prusa Research: Original Prusa MK4S assembled product page (US) (opens in a new tab)
- Prusa Knowledge Base: Warranty (opens in a new tab)
- Prusa Research: spare parts (opens in a new tab)
- Prusa Knowledge Base: MK4S assembly manuals (opens in a new tab)
- Bambu Lab US Store: A1 3D Printer product page (opens in a new tab)
- Bambu Lab US Store: P1S 3D Printer product page (opens in a new tab)
- Prusa Research: Original Prusa MK4/S Enclosure (opens in a new tab)
