I´ve used the 3D shell feature of EasyEDA Pro, and I´m very happy with it. There are a few things I´d like to remark. There is an option to make a counterbore for a screw. It would be useful to also have the option to make a counterbore for a nut. As an example, on the top you put a counterbore for an M3 screw; and on the bottom a hexagonal counterbore for an M3 nut. Also, it would perhaps be useful to know how much free space there is between pcb components and the shell, and to have a warning when a component bumps into the shell. But in general, I´m pleased with the 3d shell feature. Thanks.