The PCB Version 1.5 is a big step from the initial approach. Basically I completely redisgned the inital apprach. When I first started with this (and realized it does not work as expected) I was a bit frustrated and the whole project was buried for some years.

In the meantime I gained some experience in PCB and CAD design which contributed a bit to this new design.

The new design is now based on a BKA30D dual stepper (like many other of these projects).

Each PCB has space for the slave module and master module electronics.

The slave module shall only control the stepper motors and some other parts that need to be available on every module.

The master module has additionally an ESP32 installed that controls all other slave modules via CAN bus based communication.