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Original Prusa MK4S support

Firmware 6.5.7

June 19, 2026

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June 30, 2026

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October 23, 2024

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Assemble the Original Prusa MK4S

1. Introduction

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4B. Upgrading the Nextruder (MMU3)

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Manual changelog

Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade

8 chapters

Moderate

Upgrade to MK4S from MK3/MK3S/MK3S+

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

12 chapters

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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, CORE One INDX, MK4/S, MK3.9/S, MK3.5/S, XL)

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

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

Shipping information

Shipping information

Current lead time estimates for new orders Updated: December 10th, 2025 --> The dates are only an estimation…

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

ugly z seam, how to reduce it?

Jul 31, 2026, 1:00:17 PM
4 replies

MMU3 - to much energy on the MMU

Jul 29, 2026, 6:50:17 AM
3 replies

Doesn't do automatic unloading of filament at end of print anymore

Jul 28, 2026, 7:38:33 PM
2 replies

MK4S bed leveling constantly failing, all tests OK

Jul 27, 2026, 5:21:16 PM
1 reply

Filament curls up around nozzle first layer

Jul 23, 2026, 5:27:46 PM
3 replies

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