In the past, ECA Medical outsourced its parts to get them printed, which not only cost a significant amount of money but also took many weeks at times. They also often did not have control of tolerances when outsourcing or received parts that didn't work due to the mating components. Previously they used only in-house mold injection. When designing parts it is difficult and highly labor-intensive to do any type of interactive testing or prototyping. If there was anything wrong with the model, they needed to change the design and start the whole process again.