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dc42
I can't advise you on the mechanics, but in electrical terms that motor is fine for the Duet, Smoothie and most other electronics.
For the extruder, I recommend using a gear ratio of between 3:1 and 5:1 with 1.75mm filament, and a stepper motor with 20 to 30 Ncm holding torque at full current, with a current rating in the range 1.2 to 1.7A (or 1.2 to 2.0A if using the Duet WiFi). I use JK42HS34-1334 motors and an extruder gear ratio of 34:11.
Well, I'm studying mechanical engineering so I think I'll manage with the mechanics... :D Anyway, it's great if that trapezoidal stepper fits because I've thought to buy several components from that store. Thanks again! :)
I found this stepper which I think would be good for the extruder. It has more torque than you suggested (probably just that 'long, heavy Nema 17 motor' you wrote about) but I don't think that is a problem - quite the opposite! Other specs are very similar. What do you think? It would help if I could buy three steppers from the same place and save some shipping costs.