In the one of the plants of a tier1 automotive supplier, a new line in which injected parts will be painted needed to be properly dimentioned and validated. By using a FlexSim simulation model we were able to determine the production and logistics capacity and test sequencing scenarios, lot sizes and virtually any other system variable. Some of the key variables to analyze were the number of AGVs, initial stock sizes, injection batch sizes, supermarket capacity, stock locations, number and capacity of trolleys, etc. As there is a lot of interdependence between these parameters, and multiple references with different specifications (cavities, take rates, scrap, cycle time, etc.), checking the performance of the line through a parametrized simulation