The object is made not only with quads but uses a subdivision modifier and edges controlled with crease as seen in the presentation.
The project contains 4 objects.
1- helmet
2- bolts
3- object cutting holes for bolts using the Boolean method
4- upper grille (with the option of modifying the mesh size and thickness due to the assigned modifiers)
The helmet is a solid block without holes, as well as bolts, so it should be easily printed on a 3D printer)(the rest is light, etc.)