It was complicate to print the box in 3D because it takes too much time and someone of the CRI proposed to take some wood, to design it on makercase.com. It we will not be as specific as a 3D print but, easier to use it, make it and it’s faster. We designed a box for the solenoid and a box for the battery. For reasons of space, we decide to keep only 2 battery instead of 5. We were looking for a good material but the simplest was the wood. Easy to work with and to cut.