I have built two identical articulated arms, each has three stepper motors.
This is a question looking for a simple way to run them together, so that the g-code controlling each of them steps at the same rate.
For example, the same code runs on each controller, but only outputs to the correct arm.
It might need another device that 'steers' the outputs, and is referring to the original code for its instructions.
I know there are many other ways of controlling them, but I want to try this approach first, if only in simulated mode.