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Original Prusa MK4S

Original Prusa MK4S support

Original Prusa MK4S support

Firmware 6.4.0

November 25, 2025

PrusaSlicer 2.9.4

November 26, 2025

Handbook 1.01

October 23, 2024

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MK4S Community Forum
MK4S Printable Parts
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MK4S 360° Viewer
Sample G-codes

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Assemble the Original Prusa MK4S

Upgrade to MK4S from MK4

Upgrade to MK4S from MK3/MK3S/MK3S+

Get started with Original Prusa MK4S

First print with PrusaSlicer

First print with PrusaSlicer

If you are using PrusaSlicer for the first time to generate a gcode or bgcode for printing, you can follow the steps below. Click on the links to get more information about the…

Prusa Connect and PrusaLink explained

Prusa Connect and PrusaLink explained

Prusa Connect and PrusaLink are two remote printing solutions developed in-house by Prusa. Its origin is in the management system used in our record-sized print farm located in…

How to update firmware (CORE One L, CORE One, MK4/S, MK3.9/S, MK3.5/S, XL)

How to update firmware (CORE One L, CORE One, MK4/S, MK3.9/S, MK3.5/S, XL)

On the Prusa CORE One L, Prusa CORE One, Original Prusa MK4/S, MK3.9/S, MK3.5/S, and XL, the firmware is flashed using a USB flash drive. This is valid for all ways of firmware…

Shipping information

Shipping information

Current lead time estimates for new orders Updated: December 10th, 2025 --> The dates are only an estimation at the date of update, specified above,…

Fix common issues

QR Error codes

QR Error codes

This is an advanced system for displaying error screens, providing more useful information to the user. In case of an issue, the printer will display the name of the error followed…

Changing or replacing the Prusa Nozzle

Changing or replacing the Prusa Nozzle

Replacing the Prusa Nozzle on your printer varies depending on the model of your printer. This article provides an overview of the different methods to replace the Prusa Nozzle,…

Warping

Warping

When printing large objects, you can sometimes run into an issue with the corners of the object being lifted from the bed – mostly when printing with high-temperature materials…

Community posts

Keep getting a filament stuck message on my MK4S

Mar 12, 2026, 9:18:26 PM
111 replies

MK4S +MMU3 + 6.40 Alpha FW - Stuck at Reloading Filament - 99% Parking

Mar 12, 2026, 6:50:20 PM
48 replies

6.5.3-beta Firmware for Prusa MK4S

Mar 11, 2026, 3:33:05 PM
10 replies

Prusa MK3S+, newest firmware, RPi port, No LAN access

Mar 10, 2026, 5:38:02 AM
2 replies

Nozzle clean failed, at start of print.

Mar 7, 2026, 7:23:53 PM
1 reply

1. Introduction

2. Frame assembly

3. X-axis & X-carriage assembly

4. Z-axis assembly

5. Nextruder assembly

6. xLCD assembly

7. Y-carriage & Heatbed assembly

8. Preflight check

Manual changelog

Original Prusa MK4S kit assembly (1.01)

9 chapters

Moderate

1. Introduction

2. Upgrading the Y-axis

3. Upgrading the xLCD

4. Upgrading the Nextruder

4B. Upgrading the Nextruder (MMU3)

5. Upgrading the connectivity

6. Preflight check

Manual changelog

Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade (1.01)

8 chapters

Moderate

1. Introduction

1a. Parts check

1b. Printer disassembly

1c. Parts preparation

2. Frame assembly

3. X-axis & X-carriage assembly

4. Z-axis assembly

5. Nextruder assembly

6. xLCD assembly

7. Y-carriage & Heatbed assembly

8. Preflight check

Manual changelog

Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade (1.01)

12 chapters

Moderate