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MMU2S LEDs meaning

All red leds flashing means that there is something under the FINDA - most likely a string of filament. Once removed, the MMU should act normally again.

MMU2S Setup and Inspection

:) Reply David • over 4 years ago Hey! Thanks for the tip. You can prepare the G-codes for PET-G yourself, it is fairly easy!

ColorPrint with the MMU

Simply move the layer preview slider to desired color change height, click on the orange plus icon and select for which extruder you wish to add the color change. All extruders…

Factory reset (MMU2S pre firmware 1.0.6)

It is not necessary anymore to observe or wait for the initialization sequence. You can find out your firmware version number by navigating to LCD menu -> Support and scrolling…

Original Prusa i3 MK3/MK2.5 to MMU2 v1.01

Original Prusa i3 MK3/MK2.5 to MMU2 v1.01 | Prusa Knowledge Base English Login Prusa Research as 3D printers Materials Parts & Accessories Software 3D Models Industries Community…

Firmware updating (MMU2S)

Firmware updating (MMU2S) | Prusa Knowledge Base English Login Prusa Research as 3D printers Materials Parts & Accessories Software 3D Models Industries Community Help Academy…

MMU needs user attention

See our complete article, MMU2S Selector not moving. All five red and green LEDs blinking The MMu2S unit can detect if the stepper drivers are not able to provide enough power…

MMU loading failed

The FINDA sensor should be triggered, meaning the value should be 1. The print is thus paused until the problem is resolved by user intervention followed by a successful load or…

MMU3 Compatibility

G-code compatibility The MMU3 on MK3S+ or MK3.5 is reverse-compatible with the older MMU2S Slicer profile and G-codes - but not with the MK3 + MMU2 profiles!

Idler cannot home #04125 (MMU)

Verify all the bearings can move freely and that the center shaft at the end is inserted into the Idler properly. In case you are using the older MMU2S unit, check the MMU idler…

Registers MMU (MMU3)

Please make them writable, with that limited values tweaking for more speed is ridiculous.

IR filament sensor calibration (MMU3, MMU2S)

The IR sensor board must be perpendicular to the lever. In case the sensor keeps showing 1 even though the chimney is pushed all the way to the left, you first should make sure…

Original Prusa MMU2S Changelog

Original Prusa MMU2S Changelog | Prusa Knowledge Base English Login Prusa Research as 3D printers Materials Parts & Accessories Software 3D Models Industries Community Help Academy…

Original Prusa MMU2S

Original Prusa MMU2S | Prusa Knowledge Base English Login Prusa Research as 3D printers Materials Parts & Accessories Software 3D Models Industries Community Help Academy Blog…

MMU MCU Error #04306 (MMU)

Prusa used to offer a free MMU3 upgrade voucher to the users having this issue persisting, till the end of the last year.

Logging data over serial line (MMU2S)

When prompted for “BaudRate”, enter “115200” and hit Enter. After that, the script will start showing the communication between the printer and the MMU2S unit. It will also start…

2. MMU2S Disassembly (UPG)

The MMU2S kit alone will miss some of the important components for the MMU3 such as the Idler coupler, ferromagnetic ball for the selector, magnet for the selector, 2.5mm ID PTFE…

1. MMU Upgrade Intro

⬢ MMU2 for MK2.5 and MK3 (2018-2019) Five filaments feeding one direct-drive extruder. ⬢ MMU2S for MK2.5S, MK3S, MK3S+ (2019-2023) Introduced a chimney on the extruder with the…

MMU2S idler unable to move freely

All 5 filaments have to be loaded to the hobbed pulleys position. Then move with the selector to the far right (5th filament position) and back and observe. If you hear clicking,…

MMU2S Selector not moving

Try to re-tighten the fork connectors at the Einsy. Check if there isn't a mechanical obstruction that would prevent the selector from moving.

Factory Reset (MMU)

Keep the left side button pressed for a few seconds. You will see the LEDs on the MMU flashing quickly in a "snake" motion. Release the MMU left-side button. As soon as you release…

Introduction

Welcome Step 1 of 1 (Chapter 1 of 1) Fullscreen mode Contents Comments ⬢Welcome to the tutorial how to upgrade your Original Prusa i3 MK3 to MMU2.