frankv:

 

Klipper runs in 2 parts... one on a host (typically RPi, the same one that Octopi is on) and and the client. The client typically runs on an Arduino 8-bit e.g. Mega2560 which uses a RAMPS board to control the steppers, or both these could be on a single board e.g. PrintrBoard, ZRIB, Rambo), but could be a 32-bit controller like a Duet. I just thought it would be a tidy solution to have both controllers on one board (like a BeagleBone, but faster).

 

It's clear for me. It's the same as you would give the RPi3B+ the Arduino (client real time) part with the stepper drivers to handle additionally to the host part. When this works with an RPi3B+, with an N2 it would be even faster.

This might be a starting point (but stuck since years): http://diy3dprinting.blogspot.com/2014/10/diy-3d-printers-controlled-with.html

Commercial attempt (and this is the effort I mean) ... https://www.youtube.com/watch?v=FiVVgyGKIeM