Calculating the print time is not trivial. There are a lot of physical aspects to take into account, such as the actual speed and acceleration (and "jerk", the rate at which acceleration changes) of the print-head. With actual physical mass, and things like a bowden-tube pulling on the head, things are a lot more complicated than position = speed * time (or rather, it is complicated to calculate that velocity over time).
Having said that we have recently discovered some inaccuracies with the algorithms that simulate these physical aspects in the Cura engine, and future versions of Cura will likely have a better print-time prediction.
Well, that's pretty strange.
Normally printing time is shorter than the estimated one in Cura, around 15% perhaps.
Is it the only prototype you had to print ? Or maybe you tried other models and it was the same ?
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