How about a tinyg module that runs your software, but allows me at attach external motor controllers/drivers so I can use bigger motors. Output step/direction/enable that I can use with my own drivers. It would also be a great option for folks concerned that if a driver onboard fails, the board must be replaced.
External motor drivers
There are pin headers on tinyGV8 that make these signals available.
Schematics are here:
https://github.com/synthetos/TinyG/tree/master/hardware/v8schematics
You can interface up to 6 motor drivers if you run tinyG2 on an Arduino DUE.
Be mindful that both tinyG and DUE are 3.3V logic - you may need logic level translators to interface external drivers.
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