Raspberry Pi 4 Model B + Duet 3 6 HC

[EddyMI3D]

You may have a look here:

Klipper Architecture / Ecosystem

Klipper Architecture / Ecosystem Calling Klipper a 3D printer firmware is not complete to its full extent. In fact it is a 3D printing application with an associated ecosystem. The following overview shows how the different aspects interact. Only the red boxes is Klipper in its original sense, the other boxes are independent products forming the entire ecosystem. [Untitled Diagram.drawio] Klipper Host The core of the Klipper environment Typically running on a Single Board Computer (SBC), …

And also here:

Klipper on Duet 3 Mainboard