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Debugging the MMU2 connection

If you encounter issues with the communication between the printer board and the MMU2, please enable

#define MMU2_DEBUG

in Configuration_adv.h and connect a serial terminal to the USB port of your printer board using Pronterface, Repetier Host, Octoprint, or Arduino IDE.

The following describes a startup sequence without issues

This is the debug output you should see in the serial terminal

Startup sequence

## First tool change

When a tool change command like T0 is sent the first time, the following should happen