Running a simulation before the beginning of construction of any mold may get you out of seriously difficult situations. At Zisios SA we invested in the latest development on flow simulation programs - the Moldex3d. The least you can see in every project is the flow in filling phase and check whether your gate-s are efficient enough. Also you can check welding lines on the final part, possible air trap locations - so you can specify venting methods - efficiency of your cooling channels on the mold and finally possible warpage of the part.