Can I get by with just a raspberry pi 4 connected to the machine?

[WillAdams (William Adams (Carbide 3D))]

Short answer, yes, see:

Carbide Motion on a Raspberry Pi

If you’ve got a Raspberry Pi 4 lying around give this a shot over the weekend: https://carbide3d.com/carbidemotion/pi This was a quick R&D project and we just got it working a few hours ago so we haven’t tested it too much yet. We don’t know if the Raspberry Pi will become a supported platform for us yet, but let us know if you find it useful. PS- Be sure you run sudo apt-get update before trying to install this package if you’re on a fresh Pi install

and

https://carbide3d.com/carbidemotion/pi