I am designing a waterproof box using ABS and 3D printing process (FDM). It is for a sensor to protect the electronics getting wet. The lower part of the sensor has to be open to the environment and upper part has to be protected . I have created a 2 piece box that can be joined together using special glue, also i have added a slot for rubber cord to seal any imperfection at the joint. I have read articles on internet which mentions 3D printing does not create waterproof structures due to porosity in material because of how it is printed. (It is not a reliable technique). I am still trying my luck by increasing the perimeter to 4 and increasing infill percentage. I would love to hear more ideas and opinion on my design.