The accuracy and surface finish of a Rapid P:rototyping model is determined by its layer thickness.
RP is good on flat surfaces but can be poor on curved surfaces. RP models are left with a ladder shaped pattern along these curves. However layer thickness determines the time it takes to build a model. The idea of RP is that the user can have a model in their hand in rapid time. If it took too long to produce a small model, then it wouldn’t be rapid. The thinner the layer the more accurate the part will be, but this also means it will take longer to produce.