What do you need the "Snapmaker CAN Hub" for?

[xchrisd]

The air filter is plugged in the can hub and the future add on “filament dryer” (saw elsewhere maybe source, not sure…) will be.

Here is some source of self made “handwheels”:

Add a Serial UART Connection to a Snapmaker 2.0 Controller

Here are forum posts that cover Snapmaker control via external controllers: Admittedly, I never looked deeper (yet?) - so no idea how the actually connect.