Verifiable specifications
Product information supported by official records
| Build volume | 250 × 210 × 220 mm | View source |
|---|---|---|
| Maximum nozzle temperature | 290 °C | View source |
| Maximum heatbed temperature | 120 °C | View source |
| Included nozzle | High-flow Prusa brass CHT nozzle, 0.4 mm | View source |
| Automatic first-layer calibration | Yes | View source |
What the standard printer gives you
The Nextruder and removable PEI spring-steel sheet are part of the documented MK4S hardware. The nozzle and heatbed ceilings are 290°C and 120°C respectively. These limits describe the machine, not a universal filament profile.
Before ordering consumables or replacement parts, identify the nozzle actually installed. The factory high-flow brass nozzle is a useful baseline, but a modified printer may need a different profile and maintenance branch.
Original Prusa MK4S has the following documented build volume: 250 × 210 × 220 mm. A usable build volume sets the boundary for the object you plan to print. Compare the part in its intended orientation with this envelope before choosing the machine. This measurement is different from the printer’s outside dimensions: fitting the printer on a desk does not establish that a particular part fits inside it.
Original Prusa MK4S has the following documented maximum nozzle temperature: 290 °C. The same configuration lists supported materials as PLA · PETG · Flex · PVA · PC · PP · CPE · PVB. A hotend temperature ceiling is an operating limit, not a complete material-compatibility list or the setting for every print. Read it alongside this model’s documented filament guidance, nozzle configuration and print profiles. The maximum alone does not establish that an enclosure-dependent, abrasive or otherwise restricted material has been approved for this configuration.
Original Prusa MK4S has the following documented maximum heatbed temperature: 120 °C. The same configuration lists maximum nozzle temperature as 290 °C. Treat the bed limit separately from the hotend limit and the installed print surface. Those entries answer different questions, so a higher nozzle maximum does not automatically give the bed or surface the same capability. Use the documented material and surface combination when selecting a print profile rather than treating the maximum as a universal adhesion setting.
Original Prusa MK4S has the following documented included nozzle: High-flow Prusa brass CHT nozzle, 0.4 mm. The same configuration lists supported materials as PLA · PETG · Flex · PVA · PC · PP · CPE · PVB. Identify the installed nozzle and the exact documented replacement route before changing a print profile or ordering a spare. Diameter, material and printer-family fit are separate parts of that check. A listed option is not necessarily included in the box, and an accessory for another toolhead cannot be declared interchangeable from its appearance or nominal diameter alone.
The upgrade decision: materials or multi-material printing
Prusa lists PLA, PETG, Flex, PVA, PC, PP, CPE and PVB in its material table. ABS, ASA, HIPS and PA carry an enclosure-with-filtration condition; they should not be read as unconditional open-printer support.
For MMU3, the largest flow figure is not necessarily the useful choice. Prusa says the high-flow nozzle works, but documents the standard nozzle as producing less purge waste at the same speed in that use case. Decide from the actual multi-material job rather than assuming high-flow is always better.
Original Prusa MK4S has the following documented supported materials: PLA · PETG · Flex · PVA · PC · PP · CPE · PVB. The same configuration lists included nozzle as High-flow Prusa brass CHT nozzle, 0.4 mm. The documented material wording is the useful boundary for selecting filament. Preserve distinctions such as ideal, capable, not recommended and supported only under stated conditions. Do not turn a broad temperature specification into permission to use an unlisted material, and do not assume that support at the printer means support through every optional material feeder.
Original Prusa MK4S has the following documented materials conditioned on enclosure with filtration: ABS · ASA · HIPS · PA. The same configuration lists supported materials as PLA · PETG · Flex · PVA · PC · PP · CPE · PVB. Keep the chamber claim separate from nozzle and bed temperatures. An enclosure, an actively heated chamber and an “up to” chamber-temperature statement are not interchangeable descriptions. For the configuration documented here, check the material guidance and any stated conditions; the chamber entry alone is not evidence that every job reaches the listed maximum.
Original Prusa MK4S has the following documented mmu3 nozzle guidance: MMU3 works with the high-flow nozzle, but Prusa documents the standard nozzle as the lower-waste choice with the same speed. The same configuration lists supported materials as PLA · PETG · Flex · PVA · PC · PP · CPE · PVB. Separate the printer’s material route from the optional feeder’s route. For the documented arrangement, check which unit is required, which combinations are allowed and any excluded materials before buying an expansion package. A channel or color-capacity statement describes a configuration; it does not by itself establish that a different generation’s hardware, cable or hub can be substituted.
When a first layer or extrusion goes wrong
Automatic calibration does not replace correct sheet preparation. Start a first-layer investigation with the sheet and material context, then follow the applicable Prusa support branch. A suspected clog is a different problem: identify the nozzle before choosing a clearing method, because needle cleaning is not applicable to high-flow nozzles.
Original Prusa MK4S has the following documented automatic first-layer calibration: yes. The same configuration lists included nozzle as High-flow Prusa brass CHT nozzle, 0.4 mm. Keep the calibration capability tied to the documented sensor, hardware and procedure. A named automatic function does not eliminate the need to use the correct setup instructions or establish that every first layer will succeed. When troubleshooting, use this model’s documented checks and stop conditions rather than transferring a menu option or repair sequence from another revision.
Original Prusa MK4S has the following documented official clog-clearing boundary: Use the Prusa procedure that matches the installed nozzle; needle cleaning does not apply to high-flow nozzles, and heated parts can cause severe burns. Build the care routine from this model’s documented tasks and stop conditions, keeping any interval tied to the part it concerns. Automatic operation does not authorize skipping checks or using an unlisted service method. If the source names abnormal wear, damage, obstruction or electrical precautions, retain those boundaries and use official support when the situation falls outside the documented procedure.
Prusa Research · www.prusa3d.comPrusa Knowledge Base · help.prusa3d.comPrusa Knowledge Base · help.prusa3d.com
Exact product identity
Product identifiers in official records
GTINs, UPCs, manufacturer SKUs and model codes can identify different colors, configurations or bundles. Only identifiers stated in official records are shown; an unpublished ASIN is not inferred.
| Identifier | Exact value | Variant or bundle | Market | Source and review |
|---|---|---|---|---|
| Manufacturer product name | MK4S | Assembled or kit | United States | Prusa Research · prusa3d.comOfficial U.S.-configured product title and specifications · |
FAQ
Original Prusa MK4S frequently asked questions
Each answer stays within the facts and sources shown on this page.
01What is the Original Prusa MK4S build volume?
Prusa lists 250 × 210 × 220 mm. The official table also lists a 0.4 mm high-flow brass CHT nozzle, 290 °C maximum nozzle temperature and 120 °C maximum heatbed temperature.
02Which MK4S nozzle should I use with MMU3?
Prusa says MMU3 works with the high-flow nozzle, but documents the standard nozzle as the lower-waste option with the same speed. Confirm the installed nozzle before following a clearing procedure.
03What nozzle and first-layer system are included with the MK4S?
The included nozzle is a 0.4 mm high-flow brass CHT nozzle, and first-layer calibration is automatic. Match any later maintenance instructions to the nozzle actually installed, not only the original package.