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762x51
I like the Smoothie
Smoothie likes you too then :)
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762x51
but I also like that the Rumba's stepper drivers can be changed out if one of them decides to let the smoke out and stops working.
You may not know this, but it's also the case for your Smoothieboard.
It's important to note that the on-board drivers ( like on the Smoothieboard ) are much less likely to die than pololu drivers ( like on the Rumba ). It's really very rare, for various reasons.
But even putting that aside, if the drivers on your Smoothieboard were to die, you wouldn't have lost your Smoothieboard.
You just have to wire an external driver. It's very easy to do, it's documented, and *nearly* as cheap as replacing a pololu.
Cheers :)