The 3MS

The 3MS is short for MMMS, which stands for Modular Multi Material System

The 3MS is a simple, compact, modular, reliable, budget-friendly multimaterial system.

Why 3MS?

Why use the 3MS when there are many other multi-material systems (MMU's) ?

Here are a few reasons:

Simplified Design: Minimal mechanical complexity for increased reliability.
Low Cost: A 4-filament-unit 3MS can be built for ~$150 USD
Easily Sourceable: All the parts for the 3MS are available on Amazon. Alternatively, you can purchase a 3MS kit from West3D.
Comprehensive Documentation: Step-by-step guides to ensure smooth setup and operation.
Scalable: Easily expand the system to handle any number of filaments.

To use the 3MS, your setup has to meet the following requirements:

Run Klipper firmware
Have SSH (PuTTY) access (99.9% of Klipper installations have this, and if you don't you really should setup SSH)
Have one spare USB port
Have an adapter to install a PTFE tube to the inlet of your printer's extruder.