This is a dome that covers and protects your valuable electronics, in case of crash, the dome shields the electronics from damage.
The file is parametric
4x 3mm nuts
4x 3x10mm bolts
1x printed sphere
Use 4 3x10 mm bolts, insert into holes from inside the dome, use nut on the outside.
Place ontop of quad.
Take rubberband and put the arm inside, so the loop go around the arm and over the bolt