This is an electric box adapter for outdoor use; in my case i designed it for garden pole with a diameter of 60mm and I used a bticino electrical box as a reference.

To secure the box to the adapter, I inserted 4 m5 nuts into the print using the pause at height command and then used 2x 4mm screws to fix it to the pole.

In the shared pics there are the measurements if you want to adapt it to another box; I just recommend to use at least an IP44 or higher electrical box.