English

Support
Original Prusa MMU3

Original Prusa MMU3 support

Topics

Printer maintenance
Calibration
About your printer
Using the printer
Troubleshooting
3rd party accessories & Other projects
PrusaSlicer
Printables

Still need help?

Get support

We are here for you 24/7 all year round. If you can not find what you are looking for, please do not hesitate to contact us.

Blog

Newsletter

Signup and get our monthly squeeze on updates, blog, printables and much more.

By clicking, you agree to receive our newsletter.

This site is protected by reCAPTCHA Enterprise and the Google Privacy Policy and Terms of Service apply.

E-shop

© Prusa Research a.s.

Printables

Community

Help

Software

Company

© Prusa Research a.s.

Original Prusa MMU3 support

Firmware & Downloads

PrusaSlicer 2.9.2

June 04, 2025

Handbook 1.03

June 05, 2025

Useful links

Firmware & Downloads
MMU3 Community Forum
MMU3 Printable Parts
Sample G-codes

Assemble the Original Prusa MMU3

Upgrade your MMU3 setup

Upgrade MMU3

Get started with MMU3

Multi-material slicing

Multi-material slicing

MMU3 regular maintenance

MMU3 regular maintenance

Regular maintenance is recommended for your Original Prusa MMU3 upgrade. Refer to the images below to familiarize yourself with the names of each part of the MMU3 unit. Idler…

Shipping information

Shipping information

IMPORTANT SHIPPING UPDATE (June 23rd, 2025) Today, we have updated the shipping estimates for the majority of pending Prusa CORE One (kits, assembled printers and conversion kits)…

Fix common issues

FINDA: Filament Stuck #04102 (MMU)

FINDA: Filament Stuck #04102 (MMU)

What happened? While the MMU unit was unloading a filament, the SuperFINDA sensor inside the selector stayed triggered/detecting a filament, while it shouldn’t. The superFINDA…

FINDA: Filament Stuck #04102 (MMU)

FINDA: Filament Stuck #04102 (MMU)

What happened? While the MMU unit was unloading a filament, the SuperFINDA sensor inside the selector stayed triggered/detecting a filament, while it shouldn’t. The superFINDA…

Community posts

Questions for MMU3 Users

7/11/2025, 8:56:51 AM
9 replies

Anyone know of a good red filament to print details on black?

7/10/2025, 11:13:28 PM
4 replies

Core One MMU3 Lite: Filament Sensor trips, but filament does not reach extruder gears

7/10/2025, 7:56:04 PM
1 reply

Octoprint vs PrusaLink

OldGuyAdventure

7/10/2025, 12:14:07 PM
1 reply

Need to change the Bowden tube length in firmware

OldGuyAdventure

7/10/2025, 11:52:30 AM
12 replies

1. Introduction

2. MMU2S Disassembly (UPG)

3. MMU2S Buffer Disassembly (UPG)

4. Idler Body Assembly

5. Selector Assembly

6. Pulley Body Assembly

7. Spool holder Assembly

8A. Cassette Buffer Assembly

8B. CORE One Buffer Assembly

9A. MK4/S, MK3.9/S Nextruder mod

9B. MK3S+ / MK3.5 Extruder mod (KIT)

9C. MK3S+ Extruder (UPG)

9D. CORE One Nextruder mod

10A. MK4/S, MK3.9/S Setup and Calibration

10B. MK3S+ Setup and Calibration

10C. MK3.5 Setup and Calibration

10D. CORE One Setup and Calibration

11. First Flight

MMU3 Assembly (MK3S+, MK3.5, MK3.9/S, MK4/S, CORE)

18 chapters

Difficult

1. Introduction

2. Cassete Buffer Assembly

3. Spool Holder Assembly

4. Preparing the assembly

5. Preflight check

Original Prusa MK4S with MMU3 (assembled bundle) (1.0)

5 chapters

Moderate

1. MMU3 Assembled Core One Introduction

7. Spool holder Assembly

8B. CORE One Buffer Assembly

9D. CORE One Nextruder mod

10D. CORE One Setup and Calibration

11. First Flight

MMU3 for CORE One (Assembled)

6 chapters

Moderate

1. MMU3 Kit Core One Introduction

4. Idler Body Assembly

5. Selector Assembly

6. Pulley Body Assembly

7. Spool holder Assembly

8B. CORE One Buffer Assembly

9D. CORE One Nextruder mod

10D. CORE One Setup and Calibration

11. First Flight

MMU3 for CORE One (Kit) (1.0)

9 chapters

Moderate

1. Preparation

2. MMU3 Unit upgrade

3. Buffer upgrade

Original Prusa MK3S+ MMU3 to MK4/MK3.9 MMU3 upgrade (1.0)

3 chapters

Moderate

1. Conversion

10D. CORE One Setup and Calibration

11. First Flight

Original Prusa MK4S MMU3 to CORE One MMU3 Conversion (1.00)

3 chapters

Moderate

1. MMU Upgrade Intro

2. MMU2S Disassembly (UPG)

3. MMU2S Buffer Disassembly (UPG)

MMU2S to MMU3 Upgrade (MK3S+, MK3.5, MK3.9/S, MK4/S)

3 chapters

Moderate