Hmm, I think the best option how to built an argument that GT2 belts are good enough would be to try to argue that the moment of inertia of stepper motor rotor is so big compared to the inertia of the carriage/platform/hotend/fan that the actuall dynamic forces on the belt will be too small to lead to any significant elongation. My hunch is that neglecting this is the biggest source of error in my computation. I do not have a guess how big it is without putting down some equations though.
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