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Original Prusa MMU3 support

Original Prusa MMU3 support

Firmware & Downloads

Firmware bundles

PrusaSlicer 2.9.6

June 30, 2026

Changelog

Handbook 1.03

June 05, 2025

Assemble the Original Prusa MMU3

1. Introduction2. MMU2S Disassembly (UPG)3. MMU2S Buffer Disassembly (UPG)4. Idler Body Assembly5. Selector Assembly6. Pulley Body Assembly7. Spool holder Assembly8A. Cassette Buffer Assembly8B. CORE One Buffer Assembly9A. MK4/S, MK3.9/S Nextruder mod9B. MK3S+ / MK3.5 Extruder mod (KIT)9C. MK3S+ Extruder (UPG)9D. CORE One Nextruder mod10A. MK4/S, MK3.9/S Setup and Calibration10B. MK3S+ Setup and Calibration10C. MK3.5 Setup and Calibration10D. CORE One Setup and Calibration11. First Flight

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

18 chapters
Difficult
Begin assembly
1. Introduction2. Cassete Buffer Assembly3. Spool Holder Assembly4. Preparing the assembly5. Preflight check

Original Prusa MK4S with MMU3 (assembled bundle)

5 chapters
Moderate
Begin assembly
1. MMU3 Assembled Core One Introduction7. Spool holder Assembly8B. CORE One Buffer Assembly9D. CORE One Nextruder mod10D. CORE One Setup and Calibration11. First Flight

MMU3 for CORE One (Assembled)

6 chapters
Moderate
Begin assembly
1. MMU3 Kit Core One Introduction4. Idler Body Assembly5. Selector Assembly6. Pulley Body Assembly7. Spool holder Assembly8B. CORE One Buffer Assembly9D. CORE One Nextruder mod10D. CORE One Setup and Calibration11. First Flight

MMU3 for CORE One (Kit)

9 chapters
Moderate
Begin assembly

Upgrade your MMU3 setup

1. Preparation2. MMU3 Unit upgrade3. Buffer upgrade

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

3 chapters
Moderate
Begin assembly
1. Conversion10D. CORE One Setup and Calibration11. First Flight

Original Prusa MK4S MMU3 to CORE One MMU3 Conversion

3 chapters
Moderate
Begin assembly
MMU3 for CORE One L

MMU3 for CORE One L

Although INDX is the go-to multi-material option for most CORE One L users, the MMU3 remains as a community-supported alternative for those preferring an efficient, classic multi-color…

Upgrade MMU3

1. MMU Upgrade Intro2. MMU2S Disassembly (UPG)3. MMU2S Buffer Disassembly (UPG)

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

3 chapters
Moderate
Begin assembly

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

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

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

Length of PTFE to Extruder (MMU3)
h1ghK0
  • 4 replies
Idler Tension Screw Not Threading
JoanTabb
  • 2 replies
SOLVED: Persistent "Load to Extruder Failed" #04108 on MK3S+ / MMU2S — turned out to be the buffer-to-MMU tube, not the MMU/extruder side
amichke
  • 1 reply
Filament loading issues and extruder clicking on MK4S Nextruder
13d.Designs
  • 7 replies
MMU3 firmware update on MK4S
czechyour6
  • 5 replies

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