I’m not interested in making any money with this and if anyone is interested I would happily release the designs (such that they are!). I have just finished a 3 stepper driver design for a ESP32_DEVKIT_V1_DOIT board, albeit so far untested. Everything you need for a laser machine or a 3 axis cnc router. You can currently get 5 of these boards made for $2 …plus shipping(in my case $5 odd).
It goes to show all the extra stuff on the commercial boards that were primarily designed for 3d printers that are simply extraneous for cnc/laser control.
I built one of Barts MPCNC controller boards - the SMC stuff was a bit of a challenge and ordering the correct ESP32 board was not quite as easy as you might think due to the wide range of ESP boards that all have their own individual pinouts…ask me how I know :-), but it works really well and all credit to Bart for the firmware and Luc for the software.