Here is Overwatch Soldier's helmet from Half Life universe. The helmet consists of many parts for ease of printing and assembly. The helmet is made in such a way that there are 2 main parts - the front part and the back of the head, which are connected and separated for comfortable dressing on the head.If you make a helmet in one big piece, you will not be able to wear it. Sorry, I made this model in this way. Model ready for 3d printing. Plese chek size before printing.

Updating! I added an archive with a helmet with some details that I changed. In the helmet, I added small holes for installing magnets. Added small cavities to the filters.Created lenses for the eyes. Made a convenient connection between the headphone and helmet.