@FrankHowardNUSA if you run stepper motors at their full rated current they get very hot. It's normal to run them at 60 to 80% of that current. So 1A should be enough anyway.
Sadly it's not possible to get anywhere close to the maximum figures headlined by Trinamic, especially when space is constrained. The headline figures are for intermittent operation with a very large PCB area for heatsinking. However, we should be able to increase the maximum current of the Roto Tool board somewhat.