Since the crew at [CPSdrone] likes to build underwater drones — submarines, in other words — they need to 3D print waterproof hulls. At first, they thought there were several reasons for water entering the hulls, but the real reason was that water tends to soak through the print surface. They’ve worked it all out in the video below.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/02/18/extreme-waterproof-3d-prints/