Original Prusa MMU3 | Prusa Knowledge Base

Assemble the Original Prusa MMU3

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

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

18 chapters

Difficult

Begin assembly

Original Prusa MK4S with MMU3 (assembled bundle)

5 chapters

Moderate

Begin assembly

MMU3 for CORE One (Assembled)

6 chapters

Moderate

Begin assembly

MMU3 for CORE One (Kit)

9 chapters

Moderate

Begin assembly

Upgrade your MMU3 setup

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

3 chapters

Moderate

Begin assembly

Original Prusa MK4S MMU3 to CORE One MMU3 Conversion

3 chapters

Moderate

Begin assembly

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

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

3 chapters

Moderate

Begin assembly

Get started with MMU3

Multi-material slicing

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

Current lead time estimates for new orders Updated: December 10th, 2025 --> The…

Fix common issues

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)

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

multiple loading errors, but its never stuck?

Walter Layher

Aug 26, 2026, 12:24:10 PM
2 replies

Extruder crashing on wipe tower after firmware update

Dorfkend

Aug 25, 2026, 9:15:07 AM
5 replies

Wipe tower causing layer shift

Diem

Aug 22, 2026, 10:51:42 PM
4 replies

MMU3 Issues - "Stuck Filament Detected"

Ernst

Aug 20, 2026, 10:42:32 PM
11 replies

MMU3 standard buffer - left hand side mount for Core One +

ltlowe

Aug 17, 2026, 9:51:48 PM
2 replies

Become an expert in 3D printing

About Prusa Research

Original Prusa MMU3 support

Firmware & Downloads

PrusaSlicer 2.9.6

Handbook 1.03

Assemble the Original Prusa MMU3

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

Original Prusa MK4S with MMU3 (assembled bundle)

MMU3 for CORE One (Assembled)

MMU3 for CORE One (Kit)

Upgrade your MMU3 setup

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

Original Prusa MK4S MMU3 to CORE One MMU3 Conversion

MMU3 for CORE One L

Upgrade MMU3

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

Get started with MMU3

Multi-material slicing

MMU3 regular maintenance

Shipping information

Fix common issues

FINDA: Filament Stuck #04102 (MMU)

FINDA: Filament Stuck #04102 (MMU)

Community posts

Still need help?

Get support

Topics

Firmware & Downloads

PrusaSlicer 2.9.6

Handbook 1.03

Useful links

Assemble the Original Prusa MMU3

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

Original Prusa MK4S with MMU3 (assembled bundle)

MMU3 for CORE One (Assembled)

MMU3 for CORE One (Kit)

Upgrade your MMU3 setup

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

Original Prusa MK4S MMU3 to CORE One MMU3 Conversion

MMU3 for CORE One L

Upgrade MMU3

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

Get started with MMU3

Multi-material slicing

MMU3 regular maintenance

Shipping information

Fix common issues

FINDA: Filament Stuck #04102 (MMU)

FINDA: Filament Stuck #04102 (MMU)

Community posts