Did a cfd analysis of the housing for my arduino and the cnc shield. It was pretty hard to figure out but also very fun and most of all a valuable skill to learn. This might be a bit overkill but it actually helped me improve the case for better airflow over the heatsinks of the motor drivers to ensure keeping them cool for when the arm will be working for longer periods of time and under higher loads. For anyone interested I did this in Simscale its very easy to use and you get 10 free simulations!