3D Printing InfoBuild volume
250 x 210 x 220 mm (manufacturer figure)
Advertised dimensions; check usable space and variants.
Original Prusa MK4
The 2023 Nextruder-and-xBuddy bed-slinger that introduced load-cell first-layer calibration to the Prusa i3 line; superseded by the MK4S.
Architecture reference
Start here
Explore this printer At a glance
Nozzle temperature
300 C claimed max hotend temperature in Prusa's MK4 announcement table - note the MK4S product page publishes 290 C for the same hotend family
Published limits; hardware and firmware limits may differ.
Price snapshot
Not recorded in this catalog.
Dated listing, not a live offer. Read the configuration and region.
A closer look
Full specifications inside each chapterHardware, software & ownership
Understand the hardware, explore compatible changes and find a diagnostic starting point when something goes wrong. Expand the specification sections for every recorded value, condition and original reference.
Machine & motion
Dimensions, construction and the hardware that moves the print.
Model, variants & pricing5 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Manufacturer & exact marketed model name (verify the exact product identity first) | Original Prusa MK4 | |
| Release date (announcement and actual shipping) | Announced 29 March 2023 with assembled printers shipping immediately from stock; kits opened for ordering about two weeks later | |
| Launch MSRP (USD) | 1099 USD assembled, 799 USD as a kit, VAT included, at launch | |
| Variants & sibling models — and how to tell them apart (spec-contamination risk) | Superseded by the MK4S, which is the same machine plus a 360-degree turbine part-cooling fan, a high-flow CHT nozzle and firmware/profile work; Prusa sold a 99 USD MK4-to-MK4S upgrade kit and automatically converted unshipped MK4 orders to the S version. The MK3.5 and MK3.9 upgrades convert an MK3S+ to part of the MK4 electronics stack but are not an MK4 | |
| Market position: superseded? successor announced? | Discontinued. No MK4 appears in Prusa's Aug 2026 3D-printer listing, and the MK4 product-page slugs redirect to the MK4S page, so no live first-party price could be recorded | 2 sources
|
Size, frame & enclosure3 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Build volume X×Y×Z (mm) — advertised vs actually usable | 250 x 210 x 220 mm (manufacturer figure) | |
| Frame construction & material | Die-cast aluminium frame - Prusa replaced the MK3S+'s cut-aluminium frame for the MK4, keeping only the Y-axis profiles, some bearings, the heatbed and the power supply | |
| Enclosure: open / enclosed; panel material; door/lid | Open frame; the Original Prusa Enclosure is an optional add-on |
Motion system3 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Kinematics (bedslinger i3 / CoreXY / other) | Cartesian bed-slinger of the Prusa i3 family - Prusa's MK4 announcement records that the MK3S+ Y-axis profiles and heatbed were carried over | |
| Stepper motors (frame size, step angle, brand if known) | 400-step (0.9 degree) stepper motors, stated by Prusa to prevent vertical fine artefacts | |
| Stepper drivers (exact model e.g. TMC2209; UART/SPI; sensorless homing?) | Trinamic TMC2130-LA silent stepper drivers on the xBuddy board |
Printing system
Extrusion, heating, leveling and material handling.
Extruder2 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Type (direct drive / bowden) & design name | Nextruder direct drive with a planetary gear system, 1:10 gearbox ratio; aluminium heatsink, all-metal hotend, no PTFE tube in the filament path | |
| Gear ratio & drive gear material | 1:10 planetary gearbox |
Underextrusion after nozzle or profile changes
Check nozzle seating and use the matching high-flow or standard-nozzle slicer profile. The official guide also separates material/heat-creep causes from a physical obstruction.
Applies to: MK4 Nextruder; use the installed nozzle’s profile rather than assuming MK4 and MK4S defaults match.
Official troubleshooting Sources & dates
- Prusa Nextruder clog, nozzle-profile and enclosure checks · Checked 2026-10-20
Official MK4-to-MK4S conversion
The manufacturer kit changes cooling, high-flow nozzle hardware and related electronics/parts together rather than treating an MK4S slicer profile as a hardware upgrade.
Applies to: Stock MK4; choose the kit for its older or newer xLCD version and complete the matching firmware/printer-type setup.
Manufacturer documentation Sources & dates
- Prusa MK4-to-MK4S kit and xLCD-version compatibility · Checked 2026-10-20
Hotend & nozzle2 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Hotend design (proprietary/standard; quick-swap mechanism?) | Quick-swap nozzle system, 0.4 mm default, other diameters supported | |
| Max nozzle temp claimed AND firmware max temp limit (both values) | 300 C claimed max hotend temperature in Prusa's MK4 announcement table - note the MK4S product page publishes 290 C for the same hotend family |
Build plate & heating2 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Max bed temp claimed AND firmware limit | 120 C max heatbed temperature | |
| Bed surface (material, texture, coating), single/double-sided | Magnetic heatbed with removable PEI spring-steel sheets; compatible with the MK3 sheets (smooth PEI, satin, textured PEI, PA nylon) |
Leveling & Z-offset1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Auto bed leveling: probe technology (inductive / strain gauge / load cell / touch probe) | Load-cell sensor: fully automatic first-layer calibration with the nozzle as the probe, plus automatic mesh bed levelling over the print area |
Filament handling1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Filament runout sensor (type, location) | Built-in Hall-effect filament sensor supporting automatic filament loading |
Supported materials1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Officially supported filament list | Prusa's launch table says "any thermoplastic including Nylon and Polycarbonate"; the enclosure is still needed in practice for ABS/ASA-class materials |
Software & workflow
Firmware, controls, connections and calibration.
Electronics & power2 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Mainboard model & MCU (exact chip markings if teardowns exist) | Custom 32-bit xBuddy board with STM32, designed and built in-house, with a separate extruder breakout board | |
| PSU (brand, wattage, rail voltage) | 240 W Delta PSU with hardware power panic |
Official MK4 stock firmware
The manufacturer’s model page links its supported firmware image and release history.
Applies to: Select MK4 and the installed hardware configuration; this is an official update route, not a separate community distribution.
Manufacturer documentation Sources & dates
- Prusa MK4 model firmware and support · Checked 2026-10-20
Firmware & openness1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Firmware base & current version (Klipper fork / Marlin fork / proprietary) | Open-source Prusa Buddy firmware. The source tree (prusa3d/Prusa-Firmware-Buddy on GitHub) explicitly covers the Original Prusa MINI/MINI+, MK4, XL and CORE One and was last pushed to in August 2026. Updates are applied from a USB drive, through Prusa Connect or through the Prusa mobile app |
Right-side xLCD mounting and USB relocation
The creator supplies brackets, ribbon-cable clips and USB-extension supports to move the display where a side-access enclosure needs it.
Applies to: MK4 is explicitly listed; select the bracket/USB-extension variant and retain safe cable routing.
Creator listing Sources & dates
- ltlowe: MK4/MK4S xLCD right-side mounting kit, STL and STEP · Checked 2026-10-20
Connectivity, display & camera3 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Display: size, type, touch? | 3.5-inch 65k-colour graphic screen | |
| On-device UI capabilities (model preview, per-object controls, etc.) | On-device colour UI with one-click printing and status LEDs; Prusa Link is integrated and Prusa Connect adds remote printing | |
| WiFi (band/standard), Ethernet, USB ports, SD/flash-drive | Ethernet built in, optional ESP Wi-Fi module delivered with the printer, USB drive; print files can also arrive over LAN or the internet via Prusa Connect |
Safety, support & testing
Published safeguards, support terms and independent evidence.
Safety1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Thermal runaway protection (verify in firmware source if at all possible) | xBuddy hardware overcurrent protection disconnects heater and heatbed power when total current exceeds 15 A; firmware is open-source and auditable |
Support & ecosystem1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Warranty length & support reputation (evidence, not vibes) | 2-year warranty for consumers in the EU, Liechtenstein, Switzerland, Norway and Iceland; 1 year for EU enterprises and 1 year for the rest of the world, which includes the United States. A printer bought from a reseller or privately carries 1 year from the original delivery date and is handled by the reseller. Prusa advertises 24/7 chat and e-mail support in seven languages | 2 sources
|
Read with context
Sources & notes
How to read this guide
This guide presents the catalog’s sourced record for this exact model. Source dates belong to each reference; a page update does not mean every specification has been rechecked.
Prices are dated listing snapshots, with configuration, regional and sale conditions. They are not current offers. Unknown values remain unfilled.
Firmware, variants and available accessories can change. Read the original reference before making a purchase or planning a process.
Catalog references6 sources
- Prusa blog - Original Prusa MK4 is here (published 29 March 2023), including the MK4 specification table and launch prices · 2026-08 · doc
- Prusa blog - The Original Prusa MK4S is Here! (published 12 August 2024) · 2026-08 · doc
- Prusa 3D printers category listing with live e-shop prices, Aug 2026 · 2026-08 · vendor
- Original Prusa MK4S 3D Printer product page (Technical Parameters + CORE One+/MK4S/XL comparison table) · 2026-08 · vendor
- GitHub - prusa3d/Prusa-Firmware-Buddy (firmware for MINI, MK4, XL and CORE One) · 2026-08 · doc
- Prusa Knowledge Base - Warranty · 2026-08 · doc
Ownership research & coverage
Firmware, modifications and troubleshooting links are checked against the model and stated hardware or firmware revision. A creator’s compatibility claim is not a fit test by this site. Official troubleshooting describes a diagnostic route; individual reports do not establish a failure rate.
- Prusa MK4 model firmware and support · Checked 2026-10-20