Rugged box for DJI Osmo Action 4 Camera
This has more storage space, SD card / ND Filter Inserts than original.
6 x 30mm M3 bolts required - you can find these on Amazon & AliExpress.
Note: You can use full or half threads, I think half look nicer.
Print the insert in TPU if possible (pictured in red here), makes the filters and memory card fit perfectly - but not essential.