For an open-source FDM base

Prusa Research Original Prusa MK4S

An open-frame FDM printer with a 250 × 210 × 220 mm build volume per Prusa Research, a color touchscreen, and an optional MMU3 for multicolor.

Filament (FDM)250 × 210 × 220 mmOpen frame

Documentary analysis · Not personally tested

See the manufacturer and sellers

Prusa Research Original Prusa MK4S, manufacturer image — Image provided by Prusa Research. Equipment shown does not establish the contents of the selected bundle.

Specification sources reviewed 2026-09-12. These are manufacturer claims, not measurements by Find My 3D Printer.

Why consider it?

An open-source design with the Nextruder extruder, 360° part cooling and an ecosystem of parts and print profiles thoroughly documented by Prusa Research.

What to verify

The chassis stays open by default: the enclosure and filter are separate add-ons worth planning for regular ABS or ASA use.

The specifications that matter

Process: FDM
Nominal build volume: 250 × 210 × 220 mm
Enclosure: Open frame
Multicolor: Optional MMU3, up to 5 materials, sold separately from the printer.
Materials: PLA, PETG, Flex, PVA, PC, PP, CPE, and PVB per the spec sheet; ABS, ASA, HIPS, and PA with the optional Prusa enclosure and filter.

Allow room for supports and the chosen orientation. Confirm the exact nozzle, feeder, included accessories and installation clearance against the manual and seller’s listing.

Which projects is it for?

The MK4S is an open-frame FDM printer with a build volume of 250 × 210 × 220 mm per Prusa Research, a direct successor to the MK4 with a redesigned 360° cooling system and a high-flow Nextruder. It targets the do-everything workshop: functional parts, prototyping, and everyday PLA or PETG printing.

Available as a kit or pre-assembled, it suits both makers who want to understand their machine and users who prefer a ready-to-run setup, since both versions share the same mechanics and the same advertised performance.

Materials and setup

Prusa Research lists PLA, PETG, Flex, PVA, PC, PP, CPE, and PVB in standard configuration, with a hotend up to 290°C and a heatbed up to 120°C. ABS, ASA, HIPS, and PA require the optional Prusa enclosure with filtration.

Multicolor isn't native: adding the MMU3, sold separately, allows up to 5 materials or colors on the same part, using Prusa's own cutting-and-purge system.

What the bundle includes or not

Per Prusa Research's listing, the kit version includes the components to assemble, the power cable, a printed handbook, and access to the online manual; the assembled version ships ready to print with a smooth PEI sheet.

The 3.5-inch color touchscreen is standard on the MK4S. The enclosure, MMU3, and smoke filter remain separate add-ons: check precisely what a listing includes before comparing prices across retailers.

Alternatives to compare

For an enclosed chassis with active chamber heating on a similar bed size, the CORE One is the direct comparison at Prusa Research. The Prusa Research page places the MK4S within the rest of the lineup, including the more compact MINI+.

The FDM vs resin guide helps compare the MK4S against a machine like the SL1S SPEED depending on how much detail you need.

Frequently asked questions

Does the MK4S have an enclosed chamber?

No, it ships as an open frame. Prusa Research sells an optional enclosure as a separate accessory to stabilize ambient temperature and filter fumes.

Is multicolor included with the MK4S?

No, the MMU3 that enables up to 5 materials is a separate accessory. The base printer runs one material or color at a time.

Should you pick the kit or the assembled version?

Both share the same mechanics and the same advertised performance per Prusa Research; the kit requires assembly, while the assembled version is ready to print out of the box.

Sources and limits

We have not measured noise, real printing speed, accuracy or reliability. Manufacturer images do not establish the contents of the selected bundle.